They can't come out better!!
Anytime you shorten a heel you destroy the shoe. This is simple geometry: the angle of the shoe does not change so the only thing you are achieving is a shoe with an offset center of gravity, without proper heel support and with a smaller impact surface on the front. The best is to illustrate this through a diagram showing a small heel shortening and a moderate shortening next to a normal heel:
View attachment 3942998
This is how your shoe will touch the ground when it is shortened. Granted, you will not shorten it as much as the image on the right, but any shortening will result in an offset. Further, look at the dotted red line to see what your body weight is leaning on...
Now if geometry is not your thing, that's ok, but what about the looks?
I personally think that it is plain ugly... When a shoe is designed, the angle of the arch is part of the design, so if the shoe is too high, better get a different one.