I've found that the way to consistently make that jump is to bounce off the highest part of the spring. In other words, the part where the awning meets the wall. What I do is run up, triple jump and slide down the wall. Then do the cap dive, wall jump like usual and you should make it every time.

The technique you're talking about is called a Roll Cancel Clip. It is explained how it works at 12:01 in this video.

This is not cheating because it is possible to be performed by anyone playing the game and therefore does not give any runner an unfair advantage.

I've been thinking about what it would be like to speedrun this game for a while now and I think I've got an idea for it.

If the total score dictates your rank, I figure that a single high enough score on each stage would be enough to unlock the highest rank. So what if there was a category to get to the Lovin' Machine rank? This would be a category that actually requires playing well to get a good run.

It's been a while since before I casually unlocked Lovin' Machine, so I'm not sure if I'm correct about how the score works. I'd do some experimenting myself, but I don't want to clear my save data.

Can a video submission just be straight gameplay or does it have to have a mic/facecam or something like that?

I just had the thought that clearing every star mission in challenge mode would be a fun speed category for this game. Anyone else think so?

The game vs Bowser lasts for 5 innings. The other games are 3 innings.