klipsch cornwall iv upgraded crossovers

I have been running CW IV's with the Dynamat dampening upgrade as well as the VCap Odum and Path Audio Resistors per Don Sachs suggestions.  I love these speakers!  I still find the bass to be just OK, plenty of it, just a bit flabby and undefined IMO.  I have the CW's five feed out from front wall and have used a McIntosh MC275 VI as well as Pass Labs XA 25....augmented with four REL's, two front two rear.  Even with all RELs off, same sort of presentation.....a bit flabby and undefined.  Don't get me wrong....it's not bad, just could be better.  Surprisingly, with more power, the McIntosh tube amp actually a bit better control of bass than the Pass.  My question is, have any CW IV users experimented with the Townsend Isolation bars and gotten favorable results?  and how do your results compare to no isolation?

Thanks in advance!

Thanks Mofojo,

I'm pretty good at speaker placement....these happened to end up at 5' off the frontt wall, 10' tweeter center to tweeter center toed in at approx 6" off each shoulder.  I sit 12' from speaker line and 17 feet off the front wall.  Incredible immersive soundstage...as I said the bass isn't bad and frankly I can live with it.  I have had other systems in other rooms where the bass was so focused and real I'd just like to get closer to that....thinking maybe the Townsend Isolation bars may help.  BTW...I'm on a 6" concrete slab floor carpeted.  Simple cork sandwiches helped.

Thanks