It would be easier to erase some stages I used more than one person in, apart from Yoshi, and replace my runs.

Just the cap method. Idk WHAT I did wrong with the slide/rainbows. I must've been real tired to mess those up.

I've reviewed my runs and only the BOB-CCM and HMC-RR would have used the Cap Method, however I can remember using the actual character for a number of runs for a while, then stopping. I remember taking a long break before returning, which is when I started to use cap method. I also look forward to competing. Even with only a few runs, you've clearly established yourself as a knowledgeable and excellent player!
EDIT: My BOB 100% and WF 100% were using the actual character. Over The Rainbows Black Box was timed incorrectly, I'm not aware how but you've proved it.
(ANOTHER) EDIT: Figured it out. Any run with more than two characters submitted on the SAME DAY means I used the cap method.

It's depressing that I will have to redo my runs, as I considered going in a level, putting on a cap of a better character and submitting it as Yoshi would be cheating, but I'll respect the rules and do my runs again.

Hello Really Tall, and thank you for bringing this up.
Let me explain myself. I didn't read the rules before submitting runs and suspected you would start on the first frame you could move. Why would I think this? Because heading in a level as Yoshi and grabbing a cap seemed more reasonable than zipping back and forth changing character, wasting LOTS of time. I'm not a serious speed runner like yourself, I'm 13 and simply play this as a hobby. I'll agree that my runs were not timed correctly, and should be changed accordingly, excluding the levels where Yoshi cannot choose a cap, and Big Book's Haunt which he is unable to access. I'd like to apologise for any inconvenience this has caused Really Tall, and I will suggest you ask a mod to increase my times by the margins necessary. I will keep speed running and hopefully reclaim a few records I am now losing, but I want you to know this fault was not intentional, but an overlooked part of my run. Thanks again for bringing this up, and I'll make my runs properly from now onward.