What does the 7.5:1 vs. 10:1 translate to? Also what causes the difference?Well the 3KM is Namming me hard with 4.5" on the 10:1 and 2.5" on kuchera. I'm not really buying the Kuchera or the 10:1 since FFC said they believe a 7.5 to 1 will be what we get.