By the sound of it, you are probably better off using your existing bolt in that rifle, rather than start grinding away at some replacement and possibly ending up with a much worse situation.

I wonder whether "bolt fitting" might be an overheated topic? There are hundreds of thousands (millions?) of Enfields with mismatched bolts, and probably a large majority of those have never had the replacement bolt checked for fit. There are no observed major negative effects of a mismatched and unfitted bolt, given the huge numbers of rifles involved, so it may be that the system simply adapts to slight asymmetries in lug bearings. I.e. perhaps the bolt and receiver has sufficient inherent flex to absorb asymmetric forces, and perhaps the mismatch is eliminated fairly quickly over a few rounds in much the same way as happens when the rifle was originally built and proof-fired?