I have the same VT & RE combo and noticed the slight increase vibration at warm idle as well. I figured that it idles at lower RPMs after the engine has warmed up, which caused the slight increase in vibration. I'd tried giving it some throttle to raise the RPMs just ever so slightly (approximately from 800rpm to 900rpm) and felt the vibration decreased. Turning on the A/C will add additional load to the engine, which will keep the RPM low...and therefore vibrates a bit more...so that's my conclusion
The added vibration isn't much, but it's noticeable compared to the OE & RE mounts. However, I will trade that off with more precise gear selection any day! I don't have to wince and flip a coin at whether I will get the 2nd gear crunch anymore
