I believe the problem is with the weight of some of the blades. HI tends to produce khukris which are far larger and thicker then traditional examples. As the size increases mass grows in three dimensions (length x width x thickness) while strength grows in two dimensions (the width and thickness of the cross section). So the larger the knife the more stress accumulates on the cutting edge until the cutting edge collapses. The solution would be to come up with better materials and heat treatments to absorb the extra stress or to reduce the thickness of some of these knives, or improve the skills of the user so that they consciously use these knives within their limitations rather then constantly apply full force blows which will damage the knife. Given that available heat treat is traditional and rudimentary and that HI uses 5160 of the equivalent "truck spring steels" I do not see an easy fix for improved materials. The best solution may be to put some of these knives on a diet, to shed excess weight which may be mostly useless since the edge cannot handle the additional strain anyway.
There is no good, no evil, no saints, no demons; There are just ordinary people making ordinary choices.