In theory there should be a optimum ratio. From my opinion the ratio of a ply sheet, 4x8 = 1:2. However the Maslow design has some real life factors that will show deviation from the theoretical optimum.
We are more or less at 15° angle, have sled friction, chain sag, are limited by the amps the motor shield can handle and the power supply, a moving CG on Sled y-axis with triangular depending on what angle the chains come in and perhaps a few more I can’t come up with.
My search for the ‘holy grale’ from back in the days: Is it true that there is an optimum ratio between width and hight of the frame?