Ron, If the gun just doesn't feel right mounting above your bicep and under the ball of the shoulder, then you need to simply replace that half moon buttplate with a shotgun style buttplate, and mount the gun, shotgun style, in the pocket of your shoulder, closer to your neck. I have very broad shoulders, mutters the tailors when I am looking for sport coats. Even with my elbow lifted up to bring that bicep closer to my face Marine corps style" , It just does not feel right. I suspect I have been shooting shotguns for way too long.
Because those stocks are very straight, and do not have much drop at comb, you might want to have some fit the stock a bit, by removing part of the heel of the stock to increase the pitch of the gun. That will keep the toe of the stock from digging into your chest. Then, change the LOP by either shortening or you can lengthen it with a recoil pad. Its your gun, and your gunstock. Make if fit you.
Years ago, I had a gunsmith fit my Winch. Model 94 stock to me, by adding both spacers and a recoil pad. The stock is very straight, and now very long, but it no longer beats my cheekbone to death as if I were shooting a .458 magnum. Every man who is 6 feet and over who has put that rifle to his shoulder, or who has been able to fire a couple of rounds, tells me that is the first .30-30 they have ever fired that didn't hurt! So, I know it was not just me! The factory stock is too short, and was beating the heck out of me!