Slayer is too easy nowadays, I've personally stopped caring for max xp/h and now prefer doing tasks that can be done at bosses. I don't know what tasks you like to do but personally I'm going to block stuff like Airuts and Dark beasts when I finally get assigned them.
If you didn't know, the way preferred tasks work is you'll get assigned a task and if its not one of your preferred tasks then you'll get a 2nd roll. Preferring something like Airuts would make you get Airuts like every other task and you'll rarely get anything else.
@wilsonmagna