I think it was a mistake to give Shake It Off a Regen to buff up its support game. Essentially, it's a far stronger Divine Veil; except with Regen. It was already doing fine before they tacked that on, but after it's part of the reason why we had a Healerless TOP Clear. While I will say WAR did need the damage, now they have too much utility to compensate. As for PLD, the issue was instead with fight design for a tier that caused it to operate poorly and not fit in well with the timings of raid buffs. It was the only one that did not fit into the 2m buff window compared to other tanks.
Generally, in regards to EX6, there doesn't seem to be any issues for any of the tanks mitigation-wise so it comes to an arms race for DPS. However, staring at the current state of The Site That Shall Not Be Named, it seems GNB has top damage currently, and the buffs put PLD barely over DRK and WAR up quite a bit given their burst window buff; and that's just Week 1. Looking at it on its face, it looks mostly balanced looking at Max, but PLD does worse starting from the 80th Percentile, potentially saying that PLD still is weaker than DRK in some respects unless they play perfectly.