I don't know that Mods should be nerfed. But taking out the sub-stats like speed (not the big secondary stat like what's found on the arrow) and then significantly buffing the speed set bonus would work. Basically, then if you want to drastically speed up your character you want speed mod 4-set bonus. Or if you want a little speed and hp the 2-set speed bonus and 4-set health bonus. Basically something like that would add balance to the game and make players make decisions. "Okay, do I want speed or potency more?" for example.
Yes all RPG games have a sense of RNG and that's fine. It's just taken to an extreme in this game and is coupled with a lack of good balance.
