Well I am not sure if you are looking for how to fix the problem or if you are just looking to see if others have noticed this......but I can tell you how to fix the problem.

You can do one of 2x things, you can use new cables that have a higher strand count (thicker) to increase poundage, or you can take the existing string/cables and add twists to both until you hit your desired lbs.

If adding twists, I have found that a ratio of 3 twists into the string per every 1 twist in the cables will keep timing pretty much in check assuming you are starting both with an equal amount of twists. This will increase your preloadand will affect your max draw weight as well. Once done make sure to check letoff,draw length, etc.........to make sure these are still in spec as well.