1917 Stock Cracks. Prevention ?

Stock cracks behind the rear guard screw are commonly seen in 1917 Military and Sporter stocks. What causes this? I am in the process of restocking a sporter and would appreciate input on ways of preventing this. Would it be advisable to remove a small amount of wood from behind the rear guard screw and the tip of the rear tang? The action is glass bedded with the front recoil lug making a good full contact with the stock. Any thoughts?

poor fitting is what usually cracks a stock..

or tang screws not tite when fireing.

I detailed stripped a 1917 rebuild, and took it to the range...after about 25 rounds I tightened the screws. They were torqued before I shot, after they turned 1/2-3/4 of a turn to snug up again. FYI