COuldnt help but read this mini-spoiler before playing the game and i must confess i'm quite puzzled that in an RPG, the melee oriented character gets more damage from INT than from STR.
If your numbers are correct (wich they seem), i think larian should re-balance it somewhat so that Strenght is back on its track as more usefull to warrior builds instead of intelect. Perhaps rebalance the percentage of magical damage that weapons do, or rebalance the bonus from intelect on those weapons enhancements.
It also seems that warrior builds, with a 2h weapon are by far the most damaging types, wich probably has to do with that added damage from Intelect affecting enchantments and the magical damage of weapons. Seems to me it should be brought down a little.