My $0.02 on the factor of prestige is that you’ve bought into the USC brand a little bit more than I would. That’s me.
To people whose opinions you should care about, a T10 LAC carries more prestige if anything. A T20 or 25 as much IMO. We’re not talking about Stanford here.
But, if you’re unhappy then you’re unhappy. Going into deep debt to finance a USC education when you have a high-end school paid for would be a tough thing to decide for me. I wish I could give you the answer. But I would drop the prestige piece … you’ll have that either way you decide it.