Oh, now I get it. YES, I BELIEVE the hit box now IS on the center of the shield, right on the moss (although I could very well be wrong). But only in the shields I've changed, held on the griping point. The only way to really confirm that is by finding out wheter the hitbox location is defined by the shield model's center point position or the forearm position.
So far, by testing the anim's and shields in game, I could not say for shure. It does seems to me that it is the models location that defines it, mainly because after some good hours of playing, I got NO arrows or jarrids stuck outside of the shield, or projectiles hiting characters that were fully covered by my central griping shields. Of course that could be because of the small distance betwen the center of the forearm and the hand, combined with the large dimension of the gallic and roman shields i've been testing... The smaller the shield, the more expressive that distance is related to the shield's size, wich makes this questions really significant to tiny cavalry shields or syimilar ones. I'm gonna upload my animations and models on M&B repository files by the end of the day, so you can test for your self Mammoet!