Has anyone done a serious study of tension, string gauge and scale length? I know just enough of the physics to understand that sustain increases with tension to a point, and then decreases after that. So there must be a fairly small range of variables at which any given string gauge tuned to a given pitch is reaching its potential. Obviously the different scale lengths are designed to offer a close compromise. But has anyone done the work to see how close they really are? Of course this is leaving aside all of the other considerations -- fretting, composition of the strings, how they're anchored on either end, magnetic string pull, the quagmire issue of tonewoods, etc... I'm just looking for as simple a test as possible on the best achievable tension, gauge and length formula.