I fought them "legit" having my full party chained and having Lae'zel talking...no prebuffs, no pushing and stomped them into the ground. featherfall + triple jump and you have the upperhand after the first round. Then it's just pick and choose. At that point in the game every char in my party had dozens of scrolls+ giant hp pots and you can pretty much lock them down for numerous rounds in blind clouds and silence spheres etc
How do you get so many HP pots? I either never have gold (though, largely afraid to sell a lot of stuff), or can't find vendors with pots