Flutter below 2k rpm

@AJ/FormS
I set the idle at 800 even though it will idle lower.
These are close chamber EQ magnum heads and my quench is around .038. No pinging at all.
The TQ is 2700 stall

I did not realize I could adjust the blades on the transfer slot on an AVS other than the idle screw.
So you are recommending backing up to what? Around 16* initial ? I have tried this combined with using the 18* slots on my FBO plate. But not with the AVS.