Better stock pad? I've heard nice things about the Decelerator.
What CR said. Proper mount, holding the stock firmly in the hollow of your shoulder make a big difference. I bruised the first few times I shot 12 ga. As I got more proficient, the bruising (and the perceived recoil) largely went away. Then, I tried throwing my own birds with a hand thrower, then mounting and shooting. My mounts got slppy and I bruised again (but it CAN be done).
Magnum loads? That could make a big difference. Worst recoil I ever experienced was 3" magnum 00 buck. I will probably never shoot the rest of that box unless TSHTF.