Help needed for isolation under the power amps

Ebm, thanks but which one (Super Plus, Ultra?) As mentioned I have already Symposium Svelte Shelves under them. No mass loading?

Thanks ebm and polk432. I had the inclination to call Peter but I also needed advise if I should mass load beneath the amps.

I tried the Rollerblocks Jr and Rollerblocks Series 2+ with some degree of success before, having a feeling that the cherry cabinet resonates still a bit too much for my liking.

Maybe I should go composite, mixing various material layers - each conductive to vibrations as to pass on the energy - so that their conflicting resonance frequencies gets cancelled, hopefully yielding a nearly inert block.

Polished granite looks beautiful and I started off by mentioning that I was a.o. considering two 18x12x3" granite surface plate machinist tool (they are fugly but not that noticeable if they disappear somewhat under the amps). I intend to implement a "virtual earth" where upon "an energy diffuser" platform like the Symposium Svelte/Plus/Ultra will be put. The mono blocks can either sit directly on it or coupled through footers (depending on the budget and availability Symposium Rollerblocks HDSE, Rollerblock Series 2 or Stillpoints Ultra SS). 
A 100lbs wont ring but my back can't handle that anymore. The whole family has been put to the limit -noticed my pairs of not-so-featherlight-speaker sets ? Guess who helped them setup,,,- so I won't involve any of them helping me unless it is a matter of audio life and death. 

But I could also go the route w/o mass loading. Peter of Symposium suggests that may work. BTW Peter is a very helpful person, lightning fast email responses! I spoke only once to him several years ago and ended up with the Svelte Shelves and lots of footers. There are of course better ones like SRA but not in my budget range. 

I did more reading as I thought if resonance is the issue, why not see what speaker builders are using besides wood that is relatively cheap and easy to work with. Dupont Corian came up. Just sent off some requests on Ebay to inquire for 18"x18" plates custom made in black. I will try them at least for upstream equipment.

/Hew: I may consider DIY but like to stick with finished product for aesthetic and resale ease reasons. Definitely will try some DIY for the home theater system.
/samhar: please also see my system page. The mono blocks sit on Symposium Svelte Shelves with BDR cones/puck as footers directly onto the cabinet. The upstream equipment sit on a cabinet shelf, one indirectly through also a Symposium Svelte and a double stack of Rollerblock Series 3 (DAC), the other on a maple butcher block and Stillpoints Ultra SS (CDP).

Unlike most of you, where swapping out a cable, footer, even an isolation platform is easy, I have to disassemble everything in my "A/V niche" if I want to get anything near the mono blocks so trying out something under the mono blocks happens in reality once every blue moon and I use that opportunity to clean contacts, spray anti static stuff, check my BMI, etc.

Hence I need to ensure to have the best and most practical strategy possible.

So now we have a lot of great input, the larger question is: do I need to mass load under my amps? Should I haul two 60lbs granite slabs or some 18"x18" pavestones? Please vote now...
FYI The cabinet is relatively well put together and has a mass of at least 200lbs  (empty, estimated 350-400lbs with contents, I have removed stuff that "ring" during bass passages) but there is a drawer (not visible in my systems page) directly under the "A/V cavity" and I am not allowed to fill that one up with sand...arghh..

Keep your comments flowing...  

/bdp24: As mentioned before, I am not sure about ml as Peter of Symposium hinted it may or it may not work. Before I trend to no ml, which is of course easier for me to execute, i.e. doing nothing.
So again, I am not asking for ml but I did ask for input and got your opinion, thanks!

Minus K is indeed not an option (did you try that out yourself?). I would rather jump on the more popular SRA boat before. Besides the fact that one CJ LP140 is too heavy for the Townshend Seismic Sink, it is meant for TT where isolation is key, not transfer of energy which is more important for power amps. 

Barring an eureka moment, I will likely circle back to Symposium and add Svelte Super Plus shelves under the mono blocks and try an additional layer (probably Dupont Corian) under the upstream devices.

/cerrot: I wouldn’t gamble on the divorce as mostly one ends up with a trauma dealing with the lawyers and a residue of one's fortune, financial and emotion wise, that is in a worse case of matrimony. I count my blessings, my better half is indeed the better half. 
BTW you have nice systems! I haven’t tried Finite Elements yet.

Speaking with Peter yielded better understanding of isolation and the application of his indeed affordable products. He was very helpful!
I ordered some Svelte Plus under the amps and Segues for the upstream gear in my second system.  Thanks polk for the tip on B ware units!

A slab of 1 1/2 " granite is underway as well, just in case. I tried ml under the amp in the library as it also sits in a cabinet and it did change for the  better.