If you don't want to shoot off your arm (which is what that buttplate is designed for) take off the plate, smooth the wood and put a flat piece of metal or horn on the butt. It is a "backwoods" Southern rifle, correct? Them good old boys were the Kings of making it work with what they had. Many did not even have buttplates ( I'm not reccomending that tho). But in the end, it is your rifle, do what makes you happy.
Bruce