What was the time/ temp for the roast?
I started the ham @ 275° for 1 hour, then added the rib roast & bumped the temp to 300° until the picnic ham reached 165° and the rib roast reach 135°. The two roasts finished within about 10 minutes of each other with the ham finishing first, making the timing just right. The ham needed a little longer to rest than the rib roast.
Total time on the rib roast was around 2 1/2 hours.
I kept the probes in them and did not slice until the temps on both leveled out. Rest time was somewhere around 35 - 40 minutes.