AVS2 carb tuning. Anyone with experience out there?

I have been playing with a 800 avs for a while and am really pushing it beyond its comfort zone. Not sure what info will be helpful, most of this won’t help you, but some interesting things I have noticed. The base casting on the AVS is the same as the base casting on the AFB/performer. Meaning the holes for the counter weight shafts are there even though it has an AVS top. I epoxy the holes closed to keep air from bye passing the secondary boosters. I’m running .116 jet in front with a 6842 rod. and .107 in the rear. Now I’m running it on a 410 CI stroker with some serious effort heads. I did a test to determine when and how fast the avs door was opening. I just had no idea. It could have taken milliseconds or 2 seconds. So here is what I found. Hammer it in third gear from idle and the door starts to open at 2500 rpm and is fully open at 3000 rpm taking less than .300 of a second. It was REALLY snapping the door open. Any other vacuum secondary carb uses springs to open the throttle plates, With the spring the rate doesn’t change if you pull more air through it. I can never feel it and I have never noticed it go lean. I am on the converter up to 2500ish at launch. So I didn’t worry about it. Last weekend I helped tune a serious effort 499 B block that has to run an 800 AVS. It was snapping the door open so fast it would go LEAN. It would recover and really pull hard, it was just something very interesting to see. It probably has to do with how the dyno applies the load and I sure we are pulling more air through them than you really should. To date I haven’t really play with the door, but believe I will need to revisit that. Also I have found that at that level they REALLY like to be fat in the primaries. I have run three stages rich in front three stages lean in the secondaries. So you figure bring them back to stock and you are fine. Nope! Really doesn’t like that! I have seen the same thing on a serious effort hemi running AFB’s. Needs to be fat in front apparently to help cover the lean spot right after the AVS or counterweights snap open. I do know you can’t really crank on the door spring. It can break pretty easy. I was surprised that the 800 AVS could support 600 hp being it is really NOT a race carburetor.