This would not help the remote panel as there is no separation of the grounded (neutral) and the equipment grounding conductors in the main lug panel so the point would be mute.
Looking at the fuse box I can see that your knowledge of current flow is nil and nowhere close to what it should be for the type of undertaking you purpose. Everyone of the screw in fuses in that small panel are 30 amp fuses and probably twice the size they should be. You might as well as just bypass the fuse as it is useless for protection of the circuit.
The number of problems you have will by their self be enough to have the house condemned should an inspector get involved. Please for the safety of your family spring for at least a service call to an electrician that can evaluate your problems