Dark eye one was nice but people that played Blackguard before (Dark Eye system) will know that even with that system, all you do is cap everything that has to do with Initiative and damage first so you can buff a crapton and proceed to rekt people.
There's really no escaping from the "Initiative buffed glass cannon build" is godlike in turn-based game.
===
Flat HP on Con won't work. What we need is to add more con-based element into the game like
-Con provides Physical damage resist up to a certain cap that can be unlocked with a talent. (like 2% per point until 20 and go up to 30 or 40 with a talent)