Yeah Lego is right.
The mob you farm on is dependent on your gear. You want the highest lvl mob that you can kill quickly.
My first priority if it was me would be to get my imbue up to the same lvl as hueksal. So I would stop raising hueksal until I got imbue to 43 then 0gap till 52 like lego said.
Make sure you use the skill calculator, when I went from a 9 gap to 0 gap at 52 I spent 40k sp.
