One time I made my own it was kinda lumpy too. Tasted ok, but seemed more like a salsa than BBQ sauce. Have a stick blender. Don't think I even thought of using it. Seems like it would work.
Terry - Learning more about Q every day...
Weber Smokey Mountain 22.5" - Weber Genesis S-330
Pitmaster IQ-120 - Thermapen - Maverick ET-733
For info on any mods I have done to my WSM, please see this post