I've been screwing around with the VE (lower area), timing, cracker and idle tables and, though the car will idle nicely all the way down to 700 RPMs (big cam, supercharger, LS7 Stroker, 2Bar MAP Sensor, COS5, SD mode), if I take my foot completely off the pedal, it will dip on down below 400-500 RPM's and die. This difficulty occurred after switching to the 411 PCM. The 2002 PCM solved my RPM over-rev issues and no longer kills the transmission, but just getting it to crank initially was an issue. I have non-sensical values I had to place for Injector flow rates to get it to crank and run. It runs strong now. But, this idle thing ...

Any ideas what tables should I be massaging to overcome this?

It won't settle out at the Desired Idle values I give it. What is going on?