It's not related to magic accuracy at all, it's proc rate. Both of those spells do physical damage with a chance of additional effect happening. SE has either purposely or by glitch made the proc rate stupidly low on these. I tested this on spiders in ToAU, the ones right outside in the thickets. As a 99 with 119 gear our magic acc is so far above the target that it's would be statistically impossible to have three to four in a row do complete resists. Instead it simply never proced and thus never did a MACC/MEVD check. Use Bilgestorm instead, -25% defense / attack / -10 acc and lasts for about 90 seconds. Torb IMHO is really just for SCing and BC is similiar to Mortal Ray, just there to make a job trait.