[ATM] Mirror edge won't budge

[mock47 at accessbee.com (Art)]

Hello All,

This is my first mirror and things are going reasonably, meaning I haven't
broken it.
I have it polished and have attempted to parabolize it several times.  With
a five zone couder mask the inner three zones resolve fine, but the outer
two zones are long.  I am trying for .056 and .068 for z4 and z5
respectively.  I and getting balanced nulls in the area of .079 and .112
give or take ten or so in either direction.  I have tried a wide W and 1/4
center over center and other strokes. I cannot seem to get the edge to
deepen.  I suspect that the short center over center stroke is trying to
help but is awfully slow.  Am I just too impatent?

Any suggestions?

VR,
Art