The very reason your gunstock is fiddleback is because it is comprized of hard and even harder timber, the tree has been compressed with age due to its own wieght,yes you could have a glass like flat finish, but this wood take alott longer and therefore cost a lot more,and proberly only stay that way in the temperiture and humidity it was created, I have been doing gun stocks for forty years and from your pictures I would say you have a gun to be proud of so look arfter it,regards JDT gunsmith