Been using it a little but I noticed that in any content <lv100 you'd want to stuff 2 Gnashing Fang combos into No Mercy. Even at lv100 I'm pretty sure you'd want to hold a charge for when using tinctures too.

It's weird, it means you no longer have a mini-burst outside buffs until lv100 and with Continuation you have less weave windows during the 60s burst than at lv100 as well.