Yea actually back when me and my friends played the crap out of this game, we mastered the 1080. Every single jump in the halfpipe was a 1080 for us. So the only way to beat each other scores was to jump more times on the halfpipe in the alloted time.
Ever get more than a 1080? (nice btw, i've only gotten 1 once :P and i almost killed myself doing it)
1080 was the highest single move you could do, but if you did a normal race instead of halfpipe and got enough air you could do a 1080 and then another spin move right after it. Halfpipe mode jumps only have enough room for one 1080 though.