Since last March, I've made a few changes. I put my car on the dyno and noticed during the runs that the engine was moving a hell of a lot, and afterward I was getting some nasty bucking getting on and off throttle, so the mounts were toasted. Hard to complain, I got 2 years and about 50k miles out of them on a stage 2 car.
I know I said I'd try Vibra Technics mounts next, but I found out that FCP Euro will let you replace a part under their lifetime warranty with a different product of the same part type, and pay the difference. Since I bought the Street Density mounts from FCP, I exchanged them for a set of 034's Tracksport mounts (billet aluminum with 65A durometer rubber bushings), and boy howdy - what I said before about the engine and trans mounts not transmitting much vibration wasn't entirely correct. Turns out I just hadn't had mounts stiff enough to make a difference, but I sure did now - even after the break-in period the chassis was now just a megaphone for engine vibrations through the entire rev range. Maybe someone else can live with that, but I couldn't.
Thanks to FCP's extremely generous warranty program, I was able to exchange them for 034's Streetsport mounts (same as the Tracksport but with 50A rubber) and they're much better. They've tightened up engine movement nicely, and NVH was tolerable even when they were new. Now that they're broken in, there's a little bit of vibration at idle with the A/C on, but that's all. They're smooth and quiet during normal driving.
In sum, I think I've finally found my ideal setup that balances performance, driveability, and comfort - 034 StreetSport billet engine and gearbox mounts, APR pendulum mount, OEM upper and lower subframe bushings with 034 billet upper and lower inserts, Fluidampr, and RSR clutch with OEM flywheel.