Actually, commitment is key. The only way to boost higher is get more speed. Just remember that on pretty much any quarterpipe, you can bail in mid air and just run out when you land, it's really not a big deal. Just book it all the way to the quarter, pop off, and jump really high.
Now landing can be the hardest part. Make sure you land in the transition enough, so that you don't end up landing in like a squatting position, because that will make you loop out most of the time.