OK, I made a 1st WIP of Level 8, and the results of the flying trick, along with some other small optimizations were impressive!
944 frames saved from Level 7 fadeout to Level 8 fadeout. That brings me to almost, but not quite, 32 seconds faster than hero of the day's run up to the end of level 8. However, I just realized that while taking the alternate route through the first part of the level did save me a little time, I picked up an extra leaf. As a result, I lose 30 frames at fadeout, so it may not have been worth it to take the alternate route. I did some testing with the boss, and while it is possible to get hit by the boss and still hit him at the same time, it takes quite a while before the boss finally throws his skull again, thanks to not being far enough to the right when the boss puts itself together again. Also, I can now think of at least one more place where I might be able to tighten things up a bit. So, while I'm not exactly looking forward to it, I'm going to redo some of the level and try to squeeze out more frames.
Regardless,
here is my first attempt for those who are interested.