Arcane putting points

I noticed today that it makes quite a difference how much the head is turned up or down as to where the ball gets positioned for putting.  I moved my head up and down with the club hanging like a plumb under my eye, and was surprised to see how much the clubhead moved away and toward the feet.  Since the ball is positioned by this method, it means that the head must always be held with the same eye position.  I can do this by lining up the edge of my glasses with my knees.  This also has the advantage of making me look through my glasses at the same point, which is a very good idea because these strong near sighted glasses of mine make everything look curved, with the curve varying in degree and direction a lot between the upper and lower points on the lenses.

If you have very good muscle memory perhaps you wouldn't have to use all this lining up work.  Unfortunately I don't have it so I need everything I can do set up the same everytime.

I should note that you can't use the distance between the feet and the ball as a measure unless you can always balance yourself the same way, in regards to the proportion of weight placed between the heel and the ball of the foot.  Moving toward more weight to the ball, for example, makes the ball further from the feet.