So after several runs of Umbral pull being right at the 2 minute mark did get one way early. Not sure how early since I had stopped paying attention to pull time and such but it was less than 2 min in zone so yeah. Not really sure what triggered it. Just a theory right now but I think it might have something to do with whether or not you reapply a debuff after full bloom. Also from what I've noticed at least with debuffs on it tends to immediately full bloom after every regular tp move it does
edit: playing around it seems more and more the full blooms and possible other tp spammage seems to have more to do with dmg. ie when I was going slow was like a normal fight when my autos were Overdriving constant skillchains the mob would damn near constantly use moves
edit 2: it's becoming apparent that infernal liberation is some kind of hate reset. At first I thought mob was just shifting between autos but mule definitely been pulling hate with dia after that move even when nm is down to 40%