I just grinded the dungeons the whole way, didn't even touch questing.
At lvl 90/91 go to the broker and buy up some new gear, it's pretty cheap and the stats should be in the 105-140 range, which is massive because the expansion prior to this you were sitting at 40-50. Also throw in adornments on the items, even if they are cheapies. Get a main stat when you can. I rolled into Skyshrine after finishing up The Hole (it's very easy and good exp) and I got stomped in SS. Went to town, got the gear off the broker and it was much smoother. Again running with a full team that is optimized for each other is probably a little more stable than 3 +3 mercs (I haven't used Mercs but make sure they are the high quality kind).
Skyshrine even at lvl 94 wasn't a cake walk and I still died quite a bit, the game progressively gets more difficult, wait till you get to the lvl 95 heroic zones![]()
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