Dang Mike, that's some really good looking pork!!
Now as to rubs, and this is only my opinion and experience, I don't use any rub at all when smoking pork butts. They run nekkid all they way.
Then I use a spinning coffee grinder, the cheap ones, to make my rub into a finishing powder. Then after/while pulling the pork I sprinkle it through the meat. Let it sit and absorb into the meat, mix again and serve.
I have gotten so many raves on how the pulled pork has so much flavor. I do the same with whole hogs as well.
It may really surprise you Brother