Interesting. I did a couple racks of ribs this weekend using the 5 hour uncovered method. I had the smoker set at 225, keeping in mind that the temp does swing +/- 15 degrees or so during the cook. After 4.5 hours, the ribs appeared to be done (meat pulling back), so I added some sauce and put them back in for another 30 minutes. I then removed them to the grill for about 5 minutes. Then, I think I messed up...I took them off the grill and wrapped in foil for another 30 minutes before dinner. The ribs must have continued to cook because they ended up very dry...a first for me on ribs. However, I will say that I really liked the additional bark that I was not getting when using the 2-2-1 method.
Some lessons: first, I think I might skip the grill on the next attempt, and second, if I do try the grill, I am not going to foil them afterwards.
To answer your question...I always set for 225. I should point out that the ribs I smoked this weekend were not as meaty as some that I have had in the past. So, if your ribs were meatier, that would add to the cook time.