I rarely find strings the exact same length. You need to see the placement of the cams new. What I did on my Commander, is take a photo fo the cams when relatively new since bowtech does not give out out timing points of reference or specs anymore. When I change the strings, I want to see the cams in teh same location. I just measure a part of the cam where there is a gap between the limb and cam looking at if from a side.

You then want to use ATA specs to tighen or loosen the twists.