All good advice. In the last photo the flakes ran about half as far as they should. To correct that, pull the edge toward the face we are looking at, then direct the force along the surface more rather than perpendicular to the surface. It works best for me to flatten the concave wide first. It is also better to get that concavity out before you get too far along. Just pick up any broken bottle glass and practice on working the concavity out for a while before trying to complete a point.
WA