Taking 3's to 5's

I'm looking for some pointers from some good spinners. I have no problems with my 180's and
I have heelside and toeside 3's down. Now I'm looking to take them to 5's.

My 3's seem really slow when spinning despite having plenty of height. Such that I finish the final 180 just as I'm beginning to land. I'm looking to spin a little bit faster and have tried to pull harder / spin faster only to end up pulling myself offaxis.

Any tips as to how to spin faster so that I have time to take it to a 5?