kxkid, you and a lot of others just can't get away from treating powder coating like paint. It's not paint, it's powder coat. It's meant to be applied in a dry process. Either sprayed in a ES, (ElectroStatic spray gun), or tumbled, then baked.
We still don't know what type of powder you're using or just how you're baking it, temp, and for how long. If it's harbor freight, that's an epoxy type of paint, most others are a polyethylene type of coating.
Tumble coating can never be as uniform as a properly applied ES coating. If you want them pretty, spraying is the way to go. If what you want is to eliminate greasy lubes and eliminate leading, then tumble them and disregard an occasional bare spot on the boolits.