Yep, like mentioned above, you sir have hit the stall. A waiting game between cook and meat to see who can out last who. Patience is the name of the game and eventually the butt will give in and go above 185 and onward to your desired 195.
Foiling at 165 is one way to power through the stall and turn a 12 to 13 hour cook into a 5 or 6 hour one.
18" OTS, 22" OTG, SJ Silver, Vintage 1981 Coleman Bullet, PBC, UDS, QMaster Senior ATC