Okay, here is the question: I got a handmaiden who is a lvl 18 soldier and lvl 2 Jedi Guardian. With all the equipment and armor, she got a Strength of 19 which gives a str mod +4. But when I checked the combat breakdown, I found something strange. In the Attack Breakdown the Str mod is +4. But in the Damage breakdown, the Str mod is +6.
I've done some experiments, such as putting off all her armor, implants, etc so that her strength degraded to 15 with a str mod +2. Still, the str mod in the attack breakdown was +2 while +3 in the damage breakdown.
So, any clue about that? It seems that the str mod applied to the attack and damage are different. But I can't figure out the exact rule they used in this game.