Thanks SE. . .

[Peregrine]

Its 5-7% per touch-up. Your HQ rate sounds about right given the fact that you are using touch-ups.

Honestly, I've found that for high rank synths its best to start with HQ materials and then not even worry about bolding during the synth, in an attempt to retain as much durability as possible for more touch-ups.

I figure if I haven't gotten my result by the third touchup, the odds of it happening by the 6th are slim to none, so I bold R50's as much as I can while retaining about 60 durability for touching. The sigmoidal curves are tightest at 50, 150, and 250inflection points it seems, so 80 is huge compared to 30 for chance of +1, 180 is huge compared to 130 in regard to +2, 280 is huge compared to 230 in regard to +3.

I'm not convinced touchup is a static reroll of the chances, so I don't save as much as i can.