I agree, schlages are completely underrated as far as difficulty goes. I have a 5 pin with 4 spools from the 2 to 5 pin in it.
I just recently made a cutaway of it and i can see that the thickness of the shaft of the pick and the narrow keyway keeps oversetting pins that have already been set. Need a thinner pick.
But one trick ive heard is to put the wrench at the top of the keyway so it gives the pick more room to pick without disturbing the pins you have already set. Its easier this way. It helps for me.