Pulled Pork, Take 1

Since Lulu's Mexican closed we've been in dire need of an excellent pulled pork recipe.
Being unemployed (have I mentioned that yet? No? I got laid off. Moving on.) I figured a good thing to do with my time is to try to make a reasonable replacement for it.
Here's the recipe for my first attempt. I got it from the Fix-It & Forget-It Cookbook.

3 lbs pork, cubed (I bought three 1lb packs of "pork" from Shoprite. No specific cut was given and I didn't ask. It was the cheapest way. Good color and marbling. Came out fine. Whew!)
2 cups chopped onions
3 green peppers, chopped
1/2 cup brown sugar
1/4 cup vinegar (I used apple cider vinegar, it's what I use in my taco mix)
6 oz can tomato paste
1 1/2 Tbsp. chili powder
1 tsp. dry mustard
2 tsp Worcestershire sauce
2 tsp. salt

Throw everything in a slow cooker on Hi for 8 hours. Mix it around now and again. After 8 hours, shred the pork that hasn't already fallen apart on it's own. Mix it around some more & serve.

This is a pretty good jumping off point, but I think it really needs some more Oomph. The flavor is good, just kinda flat. I'm thinking more vinegar? Maybe some molasses? Use smoked pork?
My wife cut through the hassle and suggested throwing in some store bought BBQ sauce towards the end. It'll make the liquidy sauce a bit thicker and add some smokiness and depth to it. So next time we'll try that.

If you try it at home and decide to tinker with the recipe please let me know how it turns out!! There's still work to do, people!