How steep can your angle get before you are in danger of rolling the edge? Recently I've been trying out some really high angles and kind of liking it so far but I'm worried that it would have a dulling effect on the edge. A lot of barbers (that I've seen videos of on you tube) will use what appears to be a really high angle, but I guess they can just throw their blades away when their done. Anyone out there have much experience with this?