Doesn't an 83% predict >260? If that's the case, it's kind of douchey venting about "lack of progress" sitting that high at 3 months out and fighting for points that really don't matter. A 260+ is going to make the cutoff for getting your application looked at at any program, and 3 months of highly productive research is going to make more of an impact in admission chances than bumping up to a 270+ (by orders of magnitude). I feel like you're just kind of needlessly grinding your gears - finish world asap, take one nbme if you must, and get it over with
Obviously it's your choice though, be it a good or incredibly OCD one 😉
~2200