Had to tear into it anyways.
After a vivid memory flash, I realized I put the clutch hub thrust washer between the hub and gear instead of between the hub and case. While I was torquing the ring gear bolts, it started slipping around 45 ft-lbs. I never realized during the first assembly, it never slipped at all, even at 70 ft-lbs. Will this "slippage" get better or worse with the addition of gear lube, friction modifier, and normal heat?
So, after reassembly and not touching the pinion, I set the backlash at 0.008" again and got this pattern. I'm out of paste, so I scraped some off and mixed it with white lithium paste. This pattern looks more pronounced, but different than the first? May not be a good read with the homemade paste...