What I do I learned here. So a lot of similarities.
I don't inject. Just rub. Then low and slow until it feels done.
I've collected a lot of pork rub recipes and tossed them into a spreadsheet to look for common ratios. I do the salt separately, per Kevin's recommendation.
Here's my current rub:
Steve's Pork Rub
½ cup turbinado sugar
½ cup paprika
¼ cup chili powder
2 tablespoons granulated garlic
2 tablespoons onion powder
1 teaspoon crushed red pepper flakes
2 teaspoon cayenne
1 teaspoon dried thyme
I don't add sauce or seasoning when I pull because I might want to use some of the pork for other things rather than just BBQ.
Also, I save EVERYTHING that I remove from the pork; bones, connective tissues, fat... and I make a quick stock. Don't have to add much to it because there is so much flavor already in the pork butt detritus:
Pork Butt Stock:
2 bone-in pork butts, the remains after smoking and pulling, no BBQ sauce
2 stalks celery, chopped
1 onion, medium, chopped
1 carrot, chopped
olive oil
Heat a large pot and add a turn of olive oil. Saute the carrots and celery for about 5 minutes. Add the onions and continue to saute for another 5 minutes. Add the pork butt remains. Cover with water. Bring to boil, reduce to simmer and cook covered for 2 hours. Add water if needed. Remove from the heat and use a slotted spoon to remove most of the solids. Strain, eventually through cheesecloth, to remove remaining bits. Defat.
This stuff is AMAZING as a soup base. I could see using it to flavor and moisten reheated pork as well.
I DO add sauce when eating the pork as BBQ. I like a bit of vinegar flavor, but not a Carolina-style sauce. I also didn't want to add anything from the BBQ itself, like drippings, that might shorten the shelf life. I also don't like an overly sweet sauce. I'm looking for moderation in flavors. Here's my current recipe:
Steve's BBQ Sauce #2
2 cups ketchup
? cup apple cider vinegar
¼ cup Worcestershire sauce
2 tablespoons molasses
2 tablespoons yellow mustard
1 tablespoon Cholula hot sauce
1 tablespoon dry rub
½ teaspoon black pepper
Combine all of the ingredients in a nonreactive saucepan and slowly bring to a boil over medium-high heat. Reduce the heat to medium-low and gently simmer until dark, thick, and richly flavored, 10 to 15 minutes. Transfer the sauce to a clean jar and store in the refrigerator. It will keep for several months.