What is the difference between the XT 2000 and ZR 200 limbs on the Hoyt Havotec. I know that the XT 2000's are shorter and seem to produce more speed than ZR200 with the same cam option according to the catalog I have. I know a bow with XT 2000 is around $80 more than with ZR 200. Is this because of limb composition or the length or what? Thanx in advance, from a newbie.

Dan Blair