Doing the spin-jump counterclockwise wouldn't speed things up, the problem with spin-jump flying is simply that it's slower than normal flying, which means I bump against the P-Block a lot later...
So I decided to continue the normal flying movie, sorry Avin, maybe I'll do it in Valley Ghost House, as I have to do that passage twice, and doing it the same twice would be kinda boring. We'll see...
Now in Vanilla Dome 3 I found out something interesting. On the second "lava train" I was bored and just ran back and forth a bit, and then realized that after a while Mario was running and I could lift of for flying. So I optimized it and now saved a big deal of time! You can also see a 3UP moon on top of the screen, I didn't know that there was one...
After that I fly up and enter the bonus room; I'll now do the normal route and see which one is faster.
Getting Yoshi in the fastest way possible will also be interesting...
Anyway,
here it is. Comments are, as always, welcome! :)
PS: I also tried out the run back and forth trick in castle 2, before entering the Morton's room, but there the space is too short :(