Been there, done that, and more often than not with a smaller butt. I don’t know if those smaller cuts just lack the thermal mass to evenly get it up there but whenever I hit a stall, although I’ve only had a few stall at anything less than 150, that last for more than two hours I just go straight to the pink butcher paper wrap and 225 to 250. Once the temp starts that nice upward line again you can back the heat off if you are worried about drying out, but I trust the butcher paper to stop that. It goes long, especially if you go for a long rest time like me (2 hours plus). It will work out next, just try a bigger one.