for sharpening, I don't nececarily use "low angle" flakes, I just try to take flakes where the flaker does not hit the edge after the initial flake. I mean it does not matter as much what the angle is , just make sure the flake detaches cleanly, leaving a razor edge. to do this, I use a platform preparation different from normal. normally, i prepere a paltform by abrading, but this abrading kinda destroys the sharp edge for on either side of the intended flake. so instead i prepare the platform with multiple, minute pressure flakes, which does not harm the adjacent edges. In the end, some parts of the edge have a low angle , super sharp. But other parts of the edge have a much steeper angle, but still super sharp, and with no gringing remnants.
am i making sense here?
the main point is that a sharp edge is a series of clean flake removals with little or no abrading.
at least that's how i do it...