RE: Effect of shortening string and cable
Shortening cables gives you longer draw length, higher draw weight.
Shortening main string gives you lower draw weight, shorter draw length.
As long as you keep the twin cams in time, or the single cam within its proper rotation range, you can move brace height, and axle to axle a fair amount without stressing a bow.
When I say a fair amount, I am talking like 1/4", maybe even 3/8" from factory specs for axle to axle, and brace measurements.
Most bows I have played with seemed to perform best at, or very near the factory settings.
NRA,UBP,BASS Member
New Stanton,PA