I haven't physically measured how much the string groove is offset on my FireCat, but it's about 3/16", similar to what you'd see with older two cam systems. I guess the bow could be designed with the string groove centered on the bow, but being as they use a cable slide/rod it would probably put undo stress on the limb forks producing more cam lean than some of the bows now have.
Having shot older dual cams, then single cams, Nitrous X cams, and now the Cat cams I would say that the X system is the best at tuning and just plain accuracy, but the Cat cams aren't bad. I'm not as accurate with the FireCat, but I contribute that more to the highly reflexed riser and short A2A than the cam design.
When I'm on my game I can often shoot groups as small as 1 3/4" at 40 yards, which is as good as I ever got with some of my older, longer A2A target setups so the accuracy is there if you can shoot. Ya just have to work a little harder for it.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver