I myself hate fast temp rising butts. For me they always get my hopes up that it will be a quick cook. Then POW the plateau hits and they sit at 160º for 4 hours.
Then the temp rises up to 175 F and POW another GD 4 hr plateau.
The last one I did took 26 hr

As far as reheatin I like to collect the drippins when they are cookin and discard the fat then add back to the pork, vac seal and throw in the fridge.
Then reheat in the bag in simmerin water, not boiling it will loose the seal, and then if you need to keep warm dump the bag in a crock pot.