You are correct, @sbecks! I added a global name of PriorityValue to both of the Set Value steps, and bingo, it works! I had seen something about scopes in another thread, but thought it must not apply to this case, because of the fact it was working the first loop through. Would be really nice to have some good documentation for how this is to work.
I didn’t quite follow you on changing the name of the steps, but this seems to have taken care of the problem. Thanks so much for your time!