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IMO the easiest way would be to just create triangles between the fingers, each using two vertices of one finger and one vertex of the other. That way the weights and other values will be correct and the webbing can't clip. If you've created vertices between the fingers you have to make sure they're weighted for both fingers and correctly uv1 mapped and have the same vertex color as the fingers.
If you upload the package you have I can take a look.
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