Relatively new. Trying AST. Need serious help.

[Loggos]

Is there anything similar going on with The Dead Ends (the final EW msq dungeon)?
I don't know if I just had some really weird runs with tanks (all drk) that didn't mit properly or if my brain was on vacation everytime but it popped up in roulette a couple of times recently and somehow I really struggled during the pulls as AST.
I don't struggle in any other lvl 90 dungeon and can manage just fine with all my ogcds and an occasional gcd if the tank doesn't mit well. Drks are generally not a problem either. But during those recent runs I was using all my ogcds and pumped out benefic 2s nonstop with no time to dps.
I also ran it as scholar for comparison and ironically got a warrior that time but even then I felt like I had to use more gcds than in other lvl 90 dungeons. It surprised me because as scholar I generally don't need gcds at all during pulls unless something goes really south.
I have a really hard time discerning if I was just incredibly unlucky and the tanks didn't mit well, if the problem was on my part (bc obviously I can't rule out that I made more mistakes than usual without being aware of it) or if that dungeon's damage is considerably higher than others' at the same level?