obviously you will be TO where you can. The piano competition is awesome.
UNC nor USC are targets. For some, UNC is harder than your reaches.
UW may be a target - but you need more and a safety. Since UW is virtually test blind, it’s to your advantage.
You need more - you’re likely to get blanked or only UW. Someone wrote yesterday they see in-state UW not getting in last year with a 4.0.
I would think you will but one “target” and nothing else is a huge huge mistake.
Good luck.
PS - English or CS - you don’t just “switch” into CS - you have aptitude or not. I don’t see a test score or ECs that tell me you’d do well in CS. And you don’t back door into it if that’s what you’re trying to do. And it’s unlikely at UW. Then you’d be blanked.
Your ECs are fine as is.
Good luck to you.