Well obviously the harder your tasks you more you stand to gain, but you need to be realistic about what you can actually fight. If you're only interested in exp then there's no point fighting something you only hit every 10th attack. If Chealder is working for you then stick with her - if not, then consider moving up or down a master until you're comfortable, or when you just want some variety in your day. Ideal set ups differ from person to person, from task to task. Enhancing attack power as best you can always helps speed things up, say with a fighter torso, blackmask/slayer helm, rune defender, salve amulet (for the undead) ect ~ But this can be sacrificed for heavy/specialist armour if needed. Guthan armour is very useful, but even with it I still like to take 'emergency food' - just in case. ;D And yes blackmasks are nifty piece of kit.