Z fellows, I don't think my rear drums do much braking and I want to learn how to get them to do some braking.

My wheel cylinders and drums are in good order. I use stock shoes (might bemy problem). When I check my brakes I'm getting plenty of fluid back there and my brake proportioning valve that can restrict rear fluid is fully open. When I go to service my brakes I do have some shoe wear, but not much. Sure, there is dust back there, but my drums are blue and cracking to pieces, far from it. I've been running the same set of shoes for like a year.

Do I need to use Carbotech shoes? I'm adjusting my brakes out as far as possible either manually when I service my rears, or by using the parking brake. I can tell slight differences when I get them adjusted out, but I still don't feel like I'm getting a lot of braking back there. Definitely can't lock them up, or at least, the fronts are far and away locked up long before the backs think about it.

Any pointers?