Andrew told me it was possible, so I tried it and got it after a few tries :) By spin jumping off of a forward moving object, you keep that additional speed as long as you are in mid-air. I use an Acorn bc it gives me a very big (and overpowered) spin jump instead of a baby-spin-jump. If you glide with the acorn however, you'll always go at normal speed. (This is used to accelerate faster at the beginning of a level)