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What I said, apparently the cassette spacing is not exactly the same, so the indexing is a bit off, just slightly. That's why you get better results centering it in the middle of the cassette, it drifts away a fraction of a mm each shift. That's what read on the internet, could be wrong.
Netakure-
Yes, I understand this and it's how I've set it up. It's aligned with the 6th cog.
There was someone on weightweenies who'd produced a chart showing the alignments here
TotalShanner
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.