As for moving the battery to the trunk, I’ve always imagined moving it to the front of the trunk. In this case, the weight distribution may not be as valuable as reducing the polar moment of inertia when it comes to changing direction.
I'd still say that improving the Front/Rear weight distribution is a higher priority. The Cg position is going to favor the front end and be too high unless you go to more drastic lengths to strip weight.
A +40lb ballast that is the battery needs to be put where it makes the most difference. Putting the battery in the rear passenger side of the trunk not only offsets the drivers weight but also adds additional advantage of the moment it creates about the rear axle to further improve Cg.
