Glad to hear it turned out well! That is a long time, but like you mention, Porkbutts can take sometime. My experience is like you, 1.5 hours per pound. And you mentioning they were touching, that could have been why it was going a little longer.
I do like to cook a bit higher temps these days to cut down on the time - seems to help push things through the stall. If you have the Auber, I would imagine you can cook at a hotter temp, I’ve started to do the ramp method to ease into a hotter temp and it seems to work very well once I get to 265-275 on my cooks.
Enjoy that smoker!!!!