Thanks, I try not to stress about IVs anymore, I'm mostly trying to collect the Pokémon I need and catch what I can without worrying too much, but I can't deny having a good one escape would completely suck.
Today sucked, but I'll get over it fairly soon. The Mewtwo was only slightly better than the one I already had.
The extra bag space from using the Rare Candy is liberating, and there's basically no reason for me to get another Mewtwo other than being potential trade fodder. Niantic really needs to confirm if trading will ever come at some point.
I hatched a Feebas from my 10K egg, so that was a bright spot. It's a good thing that your trip was worthwhile.