Once the fuel gets flowing , keeps accelerating , no pinging detonation , no stumbling ?
You went from 780 cfm down to 650 cfm on a 440
Guess we would need more details on the engine build
Your metering rod change did nothing for the power circuit - You richened up the idle cruise circuit
Throw some .104 jets in the secondary side if you think it’s lean or yes to anything mentioned in my first sentence - If it helps then you might have to lighten up the air door spring again
I was chasing my tail with an 800 AVS2 installed on my 383/432 Stroker motor for some time because I concentrated so much on the primary circuit and cruise mode
I have a hard time believing this flows a full 800 cfm with those huge annular boosters hanging up front
Similiar situation when I opened the secondaries , pinging and falling flat stumble like the engine wanted to die , went to a .107 in the secondaries and down from factory .052 to a .047 power circuit on the metering rods - Factory primary jets .104
Also run the pink 7" springs
Almost perfect - So close