Heroic bosses.. kinda tough

[Lyonheart]

Have you tried any 2x raids with two groups of 3pc's + 3mercs in each group?

I have not tried any raids yet, have just done 5 man contested and instances zones so far.

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

I did the hole as well.. i got most my mid 80s to 90 there. I also only did dungon grinding all the way to 90. I went in SS when i hit 91 and got my ass handed to me, thats why i started questing. But i have done all the quests in WL now and im 93 on my SK and 92ish on my other two.

My team is geared in all 91+ gear atm.. you get a lot from questing ( better gear than you can buy per-95 ) I also hit every named in WL as often as i can.. i have some fabled items from those. SS is still kicking my ass though. I'm not going to stick around long enough to level 3 more accounts though. I will keep this trio and slowly build them the best that i can. I know I will eventually get the SS ancient mercs, they are powerful when used in SS zones, from what i hear. I will also queue some LFD solo with my tank. I do the solo SS instances a few times a day as well, with my SK and his merc healer ( i do the advanced solo one.. it gives two chests ). My other two i cant beat the hard mode solo quest.. so i do the easier ones with them. They used to be dailies, but you can reset them every 90 minutes now.