I think the tiny [and light] hammer is part of the problem. A heavier hammer wouldn't add significantly to the weight. I have several other small double action hammer fired pistols and the hammers on them have more mass and weight.

I really like the idea of smoothing up the hammer spring guide rod.
and using a very fine stone or very fine sandpaper on the rails will help it cycle better. No impact on the light strike issue by smoothing up the rails