Waitlist Additional Information?

I was waitlisted by UCLA and I’m not sure what to put in the Additional Info section besides my fall semester grades. Recently, I made it to a county-wide piano finals competition so I’m not sure if I should include that as well, along with a statement of some sort.

Would it be best to only put my fall semester grades? (Do pluses and minuses matter? I got all As but three of them are A minuses, so I’d rather not include them.)

Also, is it true that not many in-state students get off the waitlist?

I would greatly appreciate any help. Thank you!