After some time with the patch, and re-learning battle tactics the respawn rate isn't that bad.
I've been targeting mobs ~3-6 levels above the average PT member. (lv 30-35 PT target lv 38+ mobs.)
I've instructed the melee fighters of my party to each target their own mob. If we get a link of 3-4 each melee holds hate on a separate mob. Thm burn em down and cons do the healing & AOE SS.

How ever, if you're cought in the middle of a respawn cycle (every 2 min) you have the chance of getting adds on the order of 3-5+ mobs on top of the 3-4 you're already fighting. Early Crowd control is essential to surviving that scenario.