Try as you might to prevent it, Backabit, grass will grow on that exposed slope, and you or someone else will be fighting it for decades. From experience, I will tell you that forty five degrees is too steep. Bite the bullet now and change the slope to about twenty or twenty five degrees so that it can be mowed. An excavator would probably do the best job in two or three hours. Or maybe a tractor pulling a flat disc. However you accomplish it, reduce that slope, and you might not be asking Mark about your facial tic, or stutter, or why you have that growing desire to go up on that roof with your rifle.