Have beat Tengu on my best 6 challenges run so far with warrior. Lucky to get the ring of might +1 with good weapons, defensive wands and armour. I haven't really succeeded with berserker before but I think this is a good build for it... is it worth going this route? Planning to get upgraded armour and then getting to +5 ring of tenacity as it seems this ring is perfect for berserker runs.
Identify and scroll bump that plate asap. Pro tip: to identify it you can just wear it, as the warrior can identify on wear if you have chosen the identify armor perk, and I don't know why you wouldn't have.
For the berserker or gladiator think... I dunno, I just always choose gladiator because big damage, but whatever.
The risk with just throwing armor on to identify it is it may be cursed. Only do that if you have a scroll of remove curse, otherwise you could get stuck with uber heavy armor on and lose the run.