I'm not sure the filing will help, as it would present even less material on the tip, vertically--If filed down, it won't stick up as far as it did to begin with. Rather than modifying a bunch of mags to work, I'd consider having your friendly neighborhood TIG welder to add a bead or two of new material to the tip of the holdopen, and then file to reshape back into a wedge. This will restore both the sharpness (which I'm not that sure is important) and the effective height to which it will rise.
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