I was messing around in practice and found an odd glitch in 2-2 For whatever reason, running into the bees in this level can sometimes boost your vertical speed. I'm not sure what the setup for this is but this could potentially be useful

For video context

EDIT: Upon further testing i found that using the stomp on an enemy and then moving upwards gives the same speed boosting effect, this glitch is still useful in any% for the levels that you dont have stomp in

Example of really good stomp boost movement 8-3 is Possible in 20s (The first segment i mean)

Found a consistent bee boost method Upon entering 2-2 hold up left, listen to the audio cue of Cin's earflaps upon the 11th earflap hold directly right, this should be a consistent method of getting this boost