hi. when sculpting characters i normally sculpt the head and body separately. when finished i'll merge the subtools down. to connect the pieces i'll often dynamesh the merged subtool. the problem i run into is that even with dynamesh set to a really high value, for the smaller parts of the mesh eg. the fingers, dynameshing…
what you can do is scale the subtools up and you will get denser dynamesh if you are running out of resolution. But that's not a good solution when you have things scaled correctly to realworld/ project scale. At that stage you probably could be moving towards non dynameshed topology anyway though. I'd think about…
dynamesh is for sketching, not for final outputs really. its too dense for the detail you need, what you'd want is a clean basemesh with various subdiv levels to work with.