[Angelousss]

first you have to decide what you want to do with yoshi, If you don't want to keep him for his ending get rid of him now. He's just taking up xp. If you want another thief who levels your stuck w/ jan(who's actually a mage/thief) or you can take a level 4 or pick up a level 7 thief. or you can just not have a thief and make liberal use of knock and detect traps. or you can keep yoshi for awhile.

unless you pick up keldorn, viconia will yell at the other party members but not do anything drastic. just don't let your rep get above 18, cause she'll leave. Jaheira is a better fighter cause she's multiclassed. if you keep viconia give her something that increases str. She's much less effective w/out one. a certain warhammer comes to mind but that will take a little while to find.

my suggestion if you want to dual-wield, give viconia the shield and the str. increasing item, give her a good armor, a good shield and a nice weapon and watch her melee effectiveness increas(she's still not great cause of a low con. but much better) also make liberal use of protection spells. armor of faith, stoneskin, armor, spirit armor, ghost armor ect. I like to put stong melee people in front. My two weakest in the middle and the last to imbetween. the way i would do your party. me and minsc in front. then viconia and aerie, then mazzy and yoshi.