Let me see if i get right what he said. The reason the secondary doesn't open with pedal to floor, is it doesnt open on with AVS2 carb until driving. I think its what he said.
There's the spring loaded flap up top over the secondaries, and then there's the butterfly's underneath.
The flap won't open unless the engine is on the road. The butterfly's underneath definitely should open when your pedal is all the way down. They may not go to 90 degrees, but they should open pretty far. This video, starting at 0:17, shows the secondaries as far open as they should go.