Coven we've done as PLD + 2-3 BST + GEO + COR. Grasshoppers > Pixies. We've only done them 3x though since T3 that don't drop +2 aren't worth my time. Wrathare we've still only done one actual attempt of which was to about 35% just dicking around without 1hrs. It will absolutely work, it's just been a question of time management for us as I'm training / gearing up a few newer people in preparation of Escha 2 so a lot of my time has been spent working on lowman vagary / incursion stuff.
For Wrathare specifically our attempt was as GEO/NIN x2 (both being 2boxed) + COR/NIN + BST/NINx2 + PLD/NIN. Neither GEO at time of attempt had capped skills or all spells (I didn't have watera 1, only watera 2 and no meds, lol). Kill plan would be to whittle it down to about 60% slowly so can transition to zerg cleanly. Bolster frailty + indi haste + entrust vex on GEO #1 Bolster torpor + indi slow + entrust attune -> intervene -> RW + spur + unleash -> tab to GEO and cast watera as necessary -> win. Maybe I'll try to round people up to do a serious attempt this week, but none of us give a single shit about his drops so it's a bit eh. Assuming wrathare DEF can be lowered at least as low as whale's DEF, buffet with above buffs should be doing at least 35k per, possibly up to around 46k per. More than enough to counter his carrots. Example:
Interesting to note, and not sure it's 100% applicable, but I was testing stuff out in brash gate vagary this week as PLD + BST + GEO mule working on better ways to kill brimboil, and I was getting very annoyed with Murkcrawler en-amnesia slowing down kills. Entrust-vex was incredibly noticeable on en-amnesia proc rate. Since attune won't affect pets I found it to be very interesting how effective vex was on additional effects, even without bolster. I'm not sure if it makes a lot of sense, but I did this over 3 different attempts and it was MUCH better than the 2 attempts I had done prior and the level of annoyance due to amnesia definitely went down.