You could always buy the item mall skill remover thing. Saves you the trouble of having to grab all those hearts.
Also start the heart quest. Since you probably will need them eventually. Might as well have them on hand just incase ; )
It's up to you if you wanna gap to 90. You'll probably need a 4-5 gap. Which is a pain in the butt while trying to lvl. You get little sp and little exp.
I say farm. That way you'll get nice sp rolling in which makes it feel like your getting somewere..even if it is just sp
