Had an hour 30 min to kill before bed, so did a quick parse of Auspice.
My melee set built from random pieces in my MH:
Rings are Woodsman + Jaeger
Parse:
With Misery
With Misery + Auspice
First 30 min was during iceday, last 30 min was during lightningsday. Party was THF + PUP with WHM frame + me. PUP was using sushi during the second parse, THF was using meat for both. Only changed out the body piece for the occasional Regen and Cure, everything else stayed the same. No food used for me.
Dunno what to make of it, I'd guess the acc bonus only counts on main hand, and possibly only the next hit. Need to do more extended parsing as well as acc tests on even match to find the exact bonus and whether or not it counts for the duration of the spell or only the next hit.