Warrior on impossible is easiest at least timewise with different playing style

[Keneth]

There's nothing a warrior can do that a mage couldn't, and mages get an additional spell per turn so the only thing you've proven is that you weren't able to use a mage to its full potential and then used all the experience you've gathered in previous runs to play a warrior. If you had enough time to write all that you should spend some of it on your English.