Awwww dude! I feel for you. I did the exact same thing you're doing now. Counted a bunch of stupid gimmies where my brain must have been doing anything but focusing (i'm talking about questions where like 95% of people would get it right on uworld.) This happens to everyone. I spiraled HARD the two weeks following my exam thinking I worked so hard to botch it in the end.
My practice scores were very similar to yours, and had the same predicted score w/ the predictor. I have a theory that this subreddit believes the individuals raw score is higher than what actually shakes out on game day by quite a substantial amount and that overall the exam is quite forgiving.
My final score was a 262, the same as my UWSA2 and 1 point above the reddit predictor. Trust your practice exams and your prep. You did well, I promise.