I'm using 0.5 release, not autobuild. But I want to do better, I have yet to succeed doing a "perfect" run (that is, do each part as good as I can, seems I always do a mistake somewhere). I have never been good at race, it's rather odd that I have the best time right now.
Every time I manage to hit 900qu/s while doing down the long slope, I ruin the haggar part, so frustrating. So I know for sure it can be done faster than 17:42, if it's not me, it'll be somebody else. I could show a demo or video right now but IMO it's more fun to not show the "solution" until the end of the challenge.
I guess I can give you a clue, which is the only thing I can think that I might be doing different.
I'm pretty sure the only thing stopping you guys is the start, you have to do the perfect circle jump and not lose ANY speed when bunnyhopping up the first ramp near after the beginning (the one in the corridor). It's very hard to have the right timing, I succeed about 1 in 50 tries... The trick is to hit the jump almost exactly where the ramp start so the ramp won't slow you down, you'll be keeping the momentum from the jump at you go up the ramp. You should have hit 700qu/s by that time, even before going up. If you get that part right, then you might be able to hit 900qu/s when going down the bigger slope.
I haven't been able to succeed those things AND not miss the haggar part in the run so far. Grr. I've never been any good at wall climbing, I lose all sense of location somehow, no matter how many times I do it and I can't tell how far up the wall I'm at so I never let go at the right time.