1. wierd, that's never happened to me before...
2. finesse makes the attack become based on dexterity (if it's higher than your strength) but the DAMAGE is still strength-based
3. i never bothered stacking them, so i didn't notice that
4. it happens when you side with the queen? that's odd...
5. i didn't either
6. that's happened to me many times. some people have said you have to be a jedi master to get your companions to get mastery, but in my first game i was a weaponmaster, and it worked for me.
7. that gets really annoying when that happens, just save beforehand and reload if you get something you don't want
8. just go 3/4 of the way DS or LS, and then go back the other way
9. in my game at the moment i'musing a single yellow saber. it looks kinda cool
as for that Dantooine quest, i've only done that like once or twice. the rest of the time i just pick up those mines for some quick exp :D