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Yes I tried just about every combination of B-gap settings. I used the axs specific purple tool while under sag and the method you've described which is similar to how sram suggest setting it with out the tool.
"Chain Gap Adjustment without Gauge
Shift the chain into the 2nd largest cassette cog. The gap between the tallest teeth of the largest cassette cog and the upper pulley must be 5 mm"But no matter what, I couldn't get it shifting the way I expected it to. I bought the park derailleur hanger tool to rule out a bent hanger and found that it was straight.
TotalShanner
Netakure
I may be pointing the obvious here but when I do a SRAM derailleur I normally go in the second largest cog and do the b screw in enough the pulley don't overlap with the largest, otherwise you get that crunch as the pulley moves the chain against the big cog going up. Not sag or anything, just hanging on the stand.