ezj when his shields are up shoot the balls until they head back to him then his sheilds will be temporarily down, then let it rip, you may need to do this a few times.
jelf dont use ure rocket the entire time, use it to keep ure speed above 100mph instead of redlining it the entire time.
that and flying straight should get you to 6000 pretty easily... protip: only go to 4% resistance