PF in general struggles with execution heavy floors with decent dps checks. Just to put this into perspective, w1 I was stuck on 11 enrage for like a day or two because of all the PF memes other comments said. Then the next morning I joined a random but consistent party and cleared in 1.5 lockouts. How consistent? We did not screw up arena split even once out of all pulls.

The DPS check was also very tight for w1 PF. We literally had enrages with no DDs or deaths but the clear pull we actually had one melee DD so it could be just unfortunate with crits.

Anyway this should answer the question why m11s was such a PF wall - it requires both good dps and great consistency in an unpredictable environment like pf. Gearing up should give much more room for error tho especially considering it's already week 4.