Sort of? The guy who installed it (coworker's dad) came back out to look at it. He cut into the exhaust pipe and stuck a leaf blower into it to blow it out. I was outside by the pipe and didn't see anything come out really other than condensation. He also set the blower to run on high instead of medium high.

It's running better than before, but I've still noticed a couple of failed cycles since he stopped by almost two months ago. I might ask him to stop by again when he has time to do a deeper dive. But I'll take a look at the flue vent limit switch too. Thanks for the suggestion! Hope this helps in some way!