If the damage ratio between 1h and 2h is 3:5, then we could have a 60 damage onehander and a 100 damage twohander of the same rarity, item level etc. Two of those onehanders are gonna do 60+15 damage. We want the offhand to deal 40 damage instead of 15, so the total is 100. 40 is two thirds (or 66.6666...%) of 60, so that's the damage modifier you want for the offhand instead of 25%. Up to you how you want to express it in the tooltip
Still this could just be the default behavior and we can use the trait slot for something else. The Chalassa trap is ever present
I think it's okay that dual wielding gets a small stat edge; it's extra work keeping two item slots in shape instead of one. Sweeping Strike vs. Cross Cut is still the decision I make on a ranger. Vaelis on the other hand could dual wield without problems, and hell he carries two axes around in dialogues anyway. Not sure if Krimm should be allowed to dual wield though, big sword is more rawr.
