My Rogue 99 needs better isolation...please help.

If you do that you start mixing coupling & isolation. I don't know if the Rouge responds better to either system, but my preference is one or the other (coupling for me).

If you are getting serious microphonics, you may want to look to your tubes first. I used the KenRad VT231's in my Supratek, and they were my least favorite & noisiest tubes I've tried. I found this very strange since I love the KenRad VT229 in my Soro.

Bradz:
My suggestion, and what has pleased me, is to move to air isolation; specifically Townshend Seismic Sink or K-Works IsoBaseK.

I have had wonderful success with the "Sinks" (I have two, one under my transport and the other under my DAC). In the thread: http://forum.audiogon.com/cgi-bin/fr.pl?ddgtl&1105310783&openflup&13&4#13
Rcprince talks in detail about his experience with the IsoBaseK.

In my experience, tube equipment seems to love good isolation.

I'm useing Herbie HAL-O Damping rings on all my tubes in my Bat VK5i preamp.They're the best I've tried for tube microphonics and they're reasonably priced. The Cable Company carries them. My preamp rests on a set of Symposium Rollerblocks, which are great for digital or tubes. Decoupling is the way to go for a tube preamp. The rollerblocks sit on a sandfilled Bright Star Audio bigrock. This combination gave me greater dynamics, better low level detail, and better decay. Happy Listening! Stan

I have used the Octal Tube dampers from Vintage tube services with great results. They have a website. not sure of address.