I hit Quesh at 38 Hybrid spec. i never used qyzen past when you first got him. i went companionless until i got Tharan. You should ALWAYS force lift the Toughest mob, then Burn down the lessers as fast as you can.. i go with project / TT (i am specced for endless TT) Alot of the Sith / Droids like to use abilities Use mind snap, stun, mind snap as much as you can to prevent them using abilities, the more you interupt it the more they have to wait to use it. If its Melee, there shouldnt be any problem killing it. You have snare/sprint, run/knockback, stun.. and TT to use when hes running towards you. If there are too many adds at the start, use force potency to crit and even stun to lessen the damage to you. Worst case you can break Line of sight against ranged to heal kite. use Knockback to get environmental damage against those that near cliff edges (you dont get loot if it dies. but if it lands almost dead you can kill it for loot. be warned it can work against you and you get shot through floors. works best on melee.