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 drivers 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.
