I don't see any problems with my rolls in combat (without Karmic Dices). It seems to be random more or less, which is what the system is. I really don't like the randomness in dialogues. I still cannot believe that I had a 20 roll in one situation first trial when I needed it the most (the only way to win the "need 30 for approval" option), otherwise I would have save scummed without ending (which is bad design for me). But that's the shitty DnD system in general, made worse by Larian's trial to force a certain style of playing and events on me.