Next time try just putting them at 225 and leave them for 4-5 hours. I used to do 3-2-1, but found it to be unnecessary with the Traeger, they will be moist and fall off the bone without it, and it is much less work.
I also make a brown sugar based homemade dry rub, put it on the night before, let them rest overnight. Then I mix worchestire sauce and apple juice in a spray bottle, and spritz them with that once in awhile. The rub melts with the added fluids and caramelizes, and BBQ sauce isn't needed (or for me, not wanted).