Thud from rear drums

I have a 2017 Tacoma. Here is the issue. When I let off my brakes from a stop, the truck begins to roll forward. As I apply gas the truck begins to roll under the engines power and I’ll hear a thud from the right or left drum. It sounds like the rear break pads are sticking and then releasing late. I’ve taken the rear drums off cleaned and lubed pivot points, but the issue is still occurring. I’ve searched the forum, but I’m not able to find anything. Any suggestions?