I also lag to the point of being unplayable in the Tower District. I had thought it was a foul, Orcish plot to trap all the new Rangers running through the area but alas, it only appears that a few of us have been snared.
I don't see a problem with the healing limits in place. I have only 1 level 60 character which is a DC created by following an obsolete build. I have a current GS of 9000 with rank 5's in everything. Haven't run any of the lev 60 dungeons as I'm collecting my glory gear but it's not too hard to keep an Astral Shield…