I have a Scepter 4 with 14" mag limbs. I found a set of 17" elite limbs and I'm thinking about giving them a try. What I need to know is: what does the marking FU 6H mean? What will be the effect on the ATA and my string and cable lengths? I know I will need new strings and cables but how do I figure out what the specs will be? Thanks for the help.