I also have a light ACT flywheel. I have continually suffered from stalling. I thought it was a vacuum leak but turns out it wasn't. I told the guys who tuned it, the told me why and said they fixed it on the tune. Not so much.
I still haven't been able to figure it out, i was tempted to move the idle needle on the intake.
I have been blip-ping the throttle while braking until its solved...gets old fast
Your engine sounds epic