AVS2 650 Secondary Bog

I recently put a new 650 AVS2 on my 440/727 to see if it performed better than the Quickfuel 780. My car is a Challenger w/3.23 gearing, all street driving.

Am having problems with getting the secondaries to open cleanly when hitting the gas hard. Smooth acceleration into the secondaries works just fine. Seems like it must be a dead lean condition until the fuel gets flowing. I've tried tightening the air door (quite a bit), moving the accelerator pump rod to the top hole. Changed the secondary jets from .098 to .100, changed the primary rods from 70x37 to 67x37. One article I read said they fixed their bog by removing the secondary booster clusters and removing the small (secondary) emulsion tube. My carb does not have those, only the main tube one with holes. I've verified the float is set correctly. Again, the carb seems to run really well until you stomp on it.

Edit: and I went one step stiffer step up spring from orange to pink

Thoughts anyone?