Best Way for my TT to reach my Pre-Amp!?

Gosh thanks everybody. I don’t think I have the time to address each one of you, but I want to make a few points as to where I am with all of this. 

I want to go back and study all of the impedance stuff because it’s interesting and I want to learn. 
I don’t think the Rega P3 has a separate ground wire.

I have decided on a new phono stage because it’s pretty unanimous it will give me better sound as well as solve my short cable problem. In this journey have learned to make my own Duelund interconnects for when I buy a phono stage. 
I either want to buy a Schiit Mani, Atoll P200SE, or tube phono stage which I haven’t researched enough yet.

I am not quite sure why the Marantz is the limiting factor since it’s just a preamp processor and I am using the best amp I have ever heard in my limited experience, using the Atoll 500 to biamp my MA Golds. However, I am not disagreeing with you, I just didn’t think the Marantz was doing very much in the equation. 

Something you may want to consider is the iFi Micro iTube2 connected between your Marantz and Atoll amp. It will provide you some ‘tube magic’ no mater what your source is, including your phono stage. On a whim I picked one up used and placed it between my Yamaha receiver (which I also use as a processor/pre, not sure it could work the same with your 500 or not, as I only use my B&K for the 2 main channels) and ‘vintage’ B&K amp that powers my mains, and am quite happy with it. Quite an interesting piece of equipment, and seems to blow other tube buffer stages out of the water with its quality and options provided per those who have reviewed it compared to others, many that are more a gimmick than useful addition to a system.

The Marantz is a home theater processor and has a lot of electronics stuffed into one box.  It's good at a lot of things, but not great at anything including two channel music reproduction.  I have a separate two channel preamp (a Modwright LS100) that I use for two channel listening.  It lets more of the music through (I don't know how better to describe it) than the Marantz.  It has a home theater bypass circuit so I can share my amps and front channels with the Marantz when I'm using it for home theater.  The Marantz isn't bad by any measure, but it's a compromise when used for two channel music.

First, I love the analogies of Miller Carbon! It really paints the picture!

Also Greg, that makes total sense the way you explained it! Thank you!

Ok, so is there something you recommend that will act as a phono preamp that can also bipass the Marantz and go straight to my Atoll Amp being shared with the Marantz? 
I can’t stress enough the difference between the Atoll and the Anthem. How can a $4500 A5 Anthem sound like complete garbage next to the $2000 Atoll? It’s flat and dead where the Atoll is like sitting in the pit of an orchestra.