https://gswiki.play.net/Bolt_spell#Critical_Weighting
When I first saw that formula in discord, I did the exact thing and assumed it was for arrow-y folk. It wasn't until I was doing a wiki dive to id some "low hanging" thresholds for Ascension when I came across it on the bolt wiki.
As for the question Winter, I'm hoping a math genie pops in to better inform us. Currently, I'm playing with it . From +10 to +11 I haven't noticed anything cray . Now I'm about 30 mins from unlearning a point to shift it to Int, and go from +11 to +12 weighting. (47+25)/6 (if that's how it works).
I've been using 906/510 to try to keep a baseline feel, but nothing empirical.