if u wait till u level up a bit till u identify slasher then it has better stats. only keep slasher if ur going to put some points into axe expertise.
I don't think it works that way; stats are generated when you first mouse-over the item, so when you pick up the axe (or even look at it), the stats are locked. Doesn't matter if you ID it that level or 10 levels later, it's already been "rolled up."
Just keep Slasher, it sells well, and you get diddly for experience for giving it over to Smiruk.