Hello, First string length for your bow should be 56"and say for AMO 60" bow.

Now on strings, I am no expert but between dacron and fastflight/Dyna-97 is the dyna and fastflight are faster but also a little harder on the limb tips if not made for type string, and the difference between fastflight and D97 is just a couple feet per second ( I shoot D-97 8 strand flemish) The dacron string is about on the average 5 FPS slower than the others, and it has a little more stretch. As far as flemish twist, I like the way it looks, and I don't know if it adds anything but a traditional look.