My favorite strap of all time is the Peak Designs Slide because of the quick adjust feature, as being able to quickly tighten/loosen the strap is an integral part of how I brace/stabilize the rig when shooting hand held, especially while in a standing position. The one huge drawback with using heavier gear with the PD Slide is that the padding on the strap isn't adequate, and it starts to dig into my shoulder after a day out in the field. I wrote to PD to inquire about them maybe making a thicker strap, but I guess because everyone shoots dainty mirrorless cameras, they don't see a need to make something with more beefy padding So, aside from doing more shrugs in the gym, I've been on the lookout for a solution.
Enter the Specter Gear Universal Sling Pad. It's made to give more padding to shotgun/rifle slings, but it works perfectly for this application. Super simple: velcro the wider, paddier pad over the PD Slide, and the shoulder gouging ceases. You retain QD ability and get more padding. Done and done. It's also fairly affordable at $30, and comes in multiple colors.