Reading the tea leaves (or is it starting a fight) about ring gear patterns..
i would try to improve on the pattern ,, if the patterns shown are at the checking distance 2.770 i would have added 0.003 to the shim you have and check the pattern again . on the 8-3/4 with too much toe (pattern towards inside of the ring gear ) you take shim out ,, to much heel ( pattern towards outside of the ring gear ) add shim . make your shim changes in 0.003 increments . as stated above the checking distance is a start but final say is the gear pattern. pattern should look like this pic.
i would try to improve on the pattern ,, if the patterns shown are at the checking distance 2.770 i would have added 0.003 to the shim you have and check the pattern again . on the 8-3/4 with too much toe (pattern towards inside of the ring gear ) you take shim out ,, to much heel ( pattern towards outside of the ring gear ) add shim . make your shim changes in 0.003 increments . as stated above the checking distance is a start but final say is the gear pattern. pattern should look like this pic.