Two different Mal pistols; notice the difference in the hole placement.
I think un-drilled grips are the way to go.
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The picture (thanks!) illustrates exactly what I suspected, that the grips were placed on the gun and then drilled and screwed. Because of this, it only reinforces my belief that predrilled holes are going to be unreliable due to inconsistency of the location of the holes in that circular gusset.