Uh.. I can try? I know the fire salamanders have +3 weapons, I think the curst do aswell?
I've no idea what level of enchantment perfidus enemies have, but its usually the spells that mess you up there not the melee monsters really.
As for sithicus, the enemies there -were- +5 for awhile, then they got nerfed to I.. think +2 or 3? Not sure. They do so much sneak attack damage that soaking it as a normal person is pretty harsh either way, you have to use other tactics there to get by.
I mean, like I said, the cloak was a nice item, but not really relevant to your survival in these places.