800cfm on mild 360 ?

I agree with @moparoffical Primary metering rod springs need to be lightened a bit.
also too, the secondary air valve needs some counter weight added to it.
It is probably going a bit lean when they try to pull open. Weighting the air valve will fix that.

The AVS's have a spring loaded air valve just for that reason. In fact, the original AVS's used on the 340's and 383's had 3 step metering rods, where the AFB's did not.