ive tried evil parties in BG2 a couple of times, and i cant find ways to get good exp without raising my reputation, which evil chars DONT want to do. how can an evil party get good exp without becoming slaves of goodness?

Second point!---
In BG1 i found it impossible to role play evil. i HAD to save nashkel, i HAD to save baldurs gate, i COULDNT find any ways to do good quests in an evil way. what if i WANTED to ally with sarevok and TAKE OVER the sword coast!? well, i CANT!

complete the quests get the exp then kill a peasant instant loss of nine rep points

okay that solves the first part, now can you help with the second dilemma?

spoilers


there are good and evil routes for some of the quests for example in the slums instead of helping hendak to escape you could instead of tackling the beastmaster go talk to lethinan and tell him of hendaks plans chuffed with you grassing up hendak hell ask you to go kill hendak as an example to other to the other slaves you can even push him for a reward and this does not affect your ability to get discount from bernard later in the game

a second example is killing garren instead of firkraag then returning to firkraag for a reward of the cloak of shield

thats it for spoilers there are many other evil route through the game and many options open to the devious player just explore all conversation points and dont just go for the obvious,being evil is more fun

Also, if you've beaten the game, then you should know a very easy way to lower your reputation.