Anyone having trouble getting beyond 3k points: You'll need to control your sped, or your reflexes/luck will give out well before 5k points. The best way to control how fast you're going is to hit the boxes, but you need to balance it. If you hit to many, you'll go too slow for the jumps. If you don't hit enough, you'll either not have the reflexes to keep going, or more likely you'll just completely over jump a platform.
Just to point out:
On day 1, get Level 2 height and nothing else seems to be the best thing to do. For some reason upgrading width and band in addition to height will get you to ~1600 feet. Just height will get you to 1698.
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