Untrim HP is quite easy. Some quick maths: 12.9 mil exp in the 3 melee skills will get you to 12.9 mil hp. 12.9 mil exp in ranged gets you an additional 4.3 mil hp. 12.9+4.3 = 17.2 mil hp exp, leaving your melees+ranged at 98. Slayer on the other hand is alot harder. Maths: 13 mil exp in the 3 melees AND ranged = 13 mil slayer. So that means you have to use a cannon ( 2 range exp per damage as opposed to 4). Maths: 12.9 mil exp in 3 melees = 9.75 mil slayer exp. 12.9 mil exp ranged with cannon = 6.45 mil slayer exp. 9.75+6.45 = 16.20 mil slayer exp. Conclusion: Slayer is harder. And another point: you can't even cannon all tasks, not by far, which makes it even harder.
