Give this Vietnamese BBQ sauce a try. Traditionally it is used to marinate pork shoulder for Bahn Mi. I've used it on thighs and it is fantastic!
Thit Xa Xiu 5-Spice Barbecue
2 cloves garlic minced and mashed
1/2 ts five spice powder
1 ts sugar
2 ts toasted sesame oil
1.5 tbs soy sauce
2 tbs ketchup
2 tbs honey
3 tbs hoisin sauce
If you have the whole spices omit the five spice. cinnamon, cloves, fennel, star anise, and Szechwan peppercorns. Toast these in a skillet till charred then add to the sauce.
Simmer everything for a good 20 minutes.
Using this method you can strain easier for injecting and you get better flavors.