If you have noticed melee classes doing better then casters on Tactition that is because melee classes dont get any penalties like casters do.
This is the only stats boost the AI gets on tactition:
(+2 to Attack Rolls and a +2 to Save DC).
So casters get the massive nerf to spells DC but melee fighters get no penalty at all.
No wonder My fighter Lazeal domintates everyone and my wizard feels sub-par at best