Not sure if this has already been brought to attention, but certain boosts are broken on a few maps. I think only the boosts that boost you to max speed.

When you hit the boost, you kind of jam in the air and stay at the same/lower speed from before getting the boost.

Maps off the top of my head where this occurs:
the_distance (towards end)
pavilion (s2)
illumination (bonuses 2,4,5 i think)