If you can post pics of the dyno curves (from any power setting or part option, you get the graphs displayed) for each car, I can probably help. The optimum gearing depends on the powerband for the car.
The answer to this request is track dependent. It wouldnt be beneficial to create a setup that on a straight line would be optimized for acceleration but then on a track would end up in you either shifting during cornering or having to wait to shift.
On beyond the apex there is a small section about it: try to find a setup that allows your maximum speed to be achieved and then adjust the lower gears to match the most important corner exits.