Sol,

I am finally a full i90 SMN. My DET is 289 with food, and I did some testing. Wind Blade was 207-228. Ruin was 197-218.

With 479 critical hit rate, Garuda crit 15% of the time. I crit 19% of the time. Numbers appear to show that Garuda scales off of your numbers, but lower. Ruin hit for less, but of course, it's only an 80 potency move. Wind Blade is 100.