To fix this, part of the heel has to be shaved off.
The problem is that the heel height has to be properly observed in order to not counterbalance the shoe even more when the heel cap is put on. The heel height is usually measured in 1/8 of inches, across the heel breast... Ok, one more definition. The heel breast is the semicircular part of the heel that faces forward. These Maglis, specifically, were at about 3/4 when we got them, and probably between 7/8 and 8/8 when new, so that's the height we were aiming for, but now the heel had to be shaved down while keeping the heel height uniform across the entire breadth.
The perils of a shoemaker's life.