I would personally tell you to visit Vanakka (or Mazchna, but that's probably too much running between tasks, and too many too low level things) and not Chaeldar. Not to demean you, but at 100 combat (on main, not pure) I still have issues with an occasional Lost City task. What you have to realize is that Chaeldar will give you lots of things that have high def, hit hard, and are probably safe only with a hally for you. (Safe = not much food required. AND Sometimes they don't have safespots. Hello Burthorpe.) Slayer xp is directly related to damage done. It doesn't matter if you're meleeing a hill giant or hallying a troll general. The first is faster (d long vs hally), more damaging (drag vs addy/rune), and more accurate (80 atk has plenty of trouble on the generals.) And to continue our example, each hill giant drops the exact same big bone as a troll general.