Help me Identify Electrical Noise/Distortion in my System

Between the lead connector inside the heat shrink and either the center RCA pin or the sleeve depending on the signal cable.

A place to look for a possible problem regarding the dropout you get when you wiggle the R channel input is inside the chassis where there should be a wire soldered to the RCA jack or actually two wires, one to the hot and one to the ground pin on the jack itself.  It’s worth a look inside, even though in my experience it’s never that simple.  Also wiggle the wire externally to mimic the situation where you get a dropout, while observing what goes on inside at the jack.

But the resistances you measured are typical and include the resistance per foot of the wire plus the lowest resistance that your meter is capable of registering.  Most meters will not show zero ohms even when you touch the two probes directly together.  My very high quality meter measures 0.2 ohms in that case. You could also try placing one probe of your meter on the internal wire that goes to the jack hot side, before the solder joint, and the other probe up at the cartridge pin while also wiggling the wire in the way that produces the dropout.  That way you are measuring across the possible trouble spot. But don't expect a miracle.

I've done a good amount of testing on my system and some additional research and wanted to provide an update here for the community. I am still looking for advice and am by no means an expert here. I'm still learning. I recently installed a new pair of speakers that I have been waiting on for a long time - a pair of Ascend Acoustics ELX towers which are a three way design. This has isolated the woofer pumping to the low frequency drivers. The overall excursion is significantly reduced compared to my old LS50s to an acceptable amount. As a parallel issue, I have been doing some research on ground loop and EMI/RFI which I believe to be another problem in my system. 

Steps that I've taken:

1. Measured continuity in my tonearm wiring from the cartridge leads to the RCA connections on the phono preamp side of the cables and confirmed good continuity.
2. Visually confirmed the lifting mechanism of my tonearm isn't interfering with playback
3. I confirmed that my tonearm wiring isn't binding or preventing my tonearm from creating a full physical sweep across my records. There is slack in the exposed wiring between the tonearm base and the plinth. I have been thinking that the issue is then electrical in nature and not mechanical although I cannot completely rule out some sort of degradation to my tonearm wiring or connections.
4. The repair of my DH labs phono cable helped reduce the high frequency "hiss" during playback but did not eliminate it at all.
5. I have a spare TVC passive preamp from Prometheus audio that I installed into the audio chain between my Sutherland and Simaudio. This resulted in no elimination of the "hiss". My understanding is that a TVC can break a ground loop between devices due to the air gap in the TVC. I have since removed this device.
6. Installed a separate grounding cable between my Sutherland Little Loco and my Simaudio. I discovered that my Simaudio has a small chassis ground screw on the back. Now my Sutherland is the center of my chassis grounding scheme. This has greatly improved but not completely solved the issue. So adding this grounding cable reduced the Voltage potential between my equipment which must have been exacerbating the cause of the high frequency hiss during phono playback.

So the question remains what the main cause is. After some research I think its possible that the combination of my Cadenza Bronze, tonearm wiring, and Sutherland is acting like an antenna for EMI/RF. Moving the phono cables around doesn't appear to change the nature of the sound so it appears to be originating upstream. To be clear, the undesired "hiss" is now fairly minor in nature and I can certainly live with it, however the question remains how to eliminate it completely. I honestly really love the sound of my system now but there is part of me that wants to optimize what I have.

I really don't want to move my turntable but the only other thing I can think of is trying to add some shielding to my tonearm wiring. I also wonder if I could somehow run a pair of shielded ground cables directly from the ground connections on my cartridge to the ground post of my TT external to the tonearm as a test to try and bypass the internal ground wiring and determine if the turntable wiring is indeed the culprit. I may be way off base here.

Any additional thoughts here are appreciated!

The other thought I had is that "hiss" could be entirely related to a ground loop. I found an old post by Almarg which could be what I am experiencing:

"In addition to producing hum, ground loops can also result in high frequency noise and buzz, by coupling harmonic distortion components and/or noise that is typically present on the ac lines into signal return paths. However, if you don't hear that when no music is playing, or if any low level buzz or noise that you do hear is the same whether or not the equipment is temporarily floated with a cheater plug, I doubt that it would have any effect on sound quality. I suppose it is slightly conceivable that inaudible ultrasonic noise that is introduced by a ground loop could somehow intermodulate with the music and have audible effects, but it's easy enough to rule out that possibility -- just compare the sonics with and without the ac safety ground temporarily lifted via a cheater plug."

https://forum.audiogon.com/discussions/more-grounding-questions?highlight=system%2Bgrounding

I have my entire system plugged into a Furman Elite 15pfi. I don't exactly want to plug the entire thing into a cheater plug as a test...