I mean, I don't see how we can fold.
It's extremely tough for you to have AA beat there (and you certainly have to raise KJ at some point) so I think bet/3b river with AA isn't that terrible there on his part. If he does that then you're splitting with his jam range getting inf: 1 on a call so...
It also opens up a ton of other exploits for him since we have 0 calling range (all of which you're aware of I'm sure so I won't bother going on.)
Point is, don't beat yourself up for it. If your concern is that you're making mistakes not folding bottom set in a spot it's potentially not totally atrocious to do so then you're probably going to be very successful in the long run.
Also, as you pointed out, you went from lying in bed, having given up on sunday to booking a 25k score which probably pays for your BIs and pockets you 15k on the side which isn't a bad day.
Could have easily just lost 4/4 flips 18 handed and finished 15th like some other dolt
.
Gl in Barcelona and don't sweat it.