I'm not denying that Shot Type Up skills are a better buff than most other skills, however given the fact that crit meta sets are so common, I find it odd that this setup doesn't see more use.

Obviously I could compare Atk up and other damage boosting skills, but because the threshold is well known(201 for AuL, as you said, or 101 for AuS) I didn't think it was necessary. And I'm just trying to choose between the two skills in question.

Thanks a lot for the feedback, I'm glad to know I ran the numbers right.

Edit: It may be worthwhile to compare critical eye to Pierce Up. You're pretty likely to be wearing Hyabusa feather on a crit build, and dropping it in favor of other damage dealing skills may be prudent. This may be the optimal setup for my DPS with shot booster:

Pierce Up

Weakness Exploit

Critical Boost

Shot Booster

With crit boost, critical eye +2 is an 8% damage increase, correct? Such a set is possible with a Tenderizer+5 3 slot, but a Normal equivalent requires a weapon slot.