Tough deal
OK,
Here what I would suggestion...get into the gym.
Just kidding, but seriously this is a problem that tends to go away when folks can pull the weapon system back into their shoulder pocket. What I find is that focusing more at
pulling the weapon into the body tends to help keep the weapon system against the body.
Here are some other things to consider. Whenever possible start with the toe of the buttstocked staged in the shoulder pocket and then pivot into the pocket and pull back.
Next, look at placing the toe lower in the pocket. This will provide more surface area contact and require the shooter to lower their head.
Lastly, I doubt anyone is keeping you from modifying your kit. You can look at adding the Assualt Shoulder Pad, which is a piece of nylon with tacky rubber on it that velcros onto your armor. It works great and I really like them for maritime work when things are really slippery.
Get a hold of a new
Diamondback Tactical catalog and look on page #46. Good luck.
Erick, thanks for the kind words and stay safe. Will pass you grid coordinates to my new position down the road so stay in touch.
Later,