Torgthen doesn't really have anything decisive; he is more of a steady, endurance character, though his bonus to hit doesn't seem like it is remotely high enough for the theme in this game.
For level appropriate enemies it IS high enough. But these guys are at least +2 or +3, with a heavier boost on AC than on the rest.
There was that discussion recently about level 10 PCs meeting a CR 14 monster with 40 AC - and they were supposed to beat it without too much trouble. But none of you guys are Tier 1, I expected you to have trouble with this fight (it is, if you add it all up, EL 17, after all
) Now I didn't originally spring these guys on you to actually fight you - they only threatened you initially, and there was a choice to be made, there. It's always hard to scare players enough to NOT seek a fight in a certain situation, and maybe I didn't make it all clear enough. But now we all have to live with these choices, and I certainly don't want to kill any of you off.
In the end, this is just the problem with meleers: You need to hit for everything, and AC is easily and cheaply buffed - for monsters. (In fact these demons can hardly hit each other.)
Once you have a bit of downtime, and some cash, you can boost your to hit a little more. For now you just have to live with only being able to hit the enemies reliably after they have been debuffed in several ways. Now look at the bright side: Even with the debuffs, the casters could have trouble against them.