I made some changes according to your suggestions, including outright disallowing glass cannon for normal mode. I think Glass Cannon will be a proper risk-reward situation in hard mode when you don't have the +Health talents to rely on. I know that at level 15 I've been hit for more than 415hp in a turn more than once and that's on a 50+% all resist, full plate armor warrior.

We're talking -75% vs -25% Health, meaning you lose 2/3 of your Health which can't properly be countered as seen in the comparisons.