Oh yeah you are definitely on the journey now. Many of us have been on that path before, so enjoy the tinkering!!! :DThank you! Yes, learning a bit more about the stall - not something I've seen much, as this was my second pulled pork run, I've only done one brisket, and one attempt at poor man's burnt ends.
I've been experimenting with a few different things each time (injection vs just rub, fat up vs down, low temp vs higher temp), and getting a bit more comfortable with how to deal with time variations - lots of great pointers from folks.
I do want to give a try at a 300˚F cook, and then try to settle on a method for pulled pork, so I can refine it.
For sure, it's WAY better than what we used to do, using a crock pot and store bought BBQ sauce.
With your next pork butt attempt at 300F, a good approach to consider as a baseline. Would be to season up, do your time estimate guesstimating the time per pound at 300F, then throw on the smoker and not do anything until the temp probe tells you to check for tenderness (about 203-205F). Well maybe one check at about an IT of 190F just to ensure nothing odd is happening, but remember. If you are lookin you're not cookin :D
I would wager a guess to say your bark comes out better and the time management becomes clear at that weight for that time it takes before it reports to test for tenderness.
If you want more bark and flavor to the point where you eliminate the need for finishing sauce or additional seasoning that could be worked in easily as well but that involves 1 more meat prep step.
I think you are 1-2 pulled pork cooks away from eliminating mysteries and then maybe 1-2 cooks after that will nail in your seasoning, bark, and standardize your approach for complete consistency.