mr. pretzel is right on this one children. The alpha 2 is recommended at -2.5 back because that is in fact the center. yes when you lay them on the ground and find the half way point it is going to be in the true center of the ski. but with the way armada designed these skis, -2.5 is the true center of the camber. for those of you who have access to a pair, lay them down and if you actually look at them you will realize that the they are not shaped like a conventional ski. the camber starts a little farther back because of the elf shoe tech they have going on so the center is set back ~ 2.5 cm and mounting at the exact center of the ski will make them feel a tad shorter... everyone can bitch and moan but when it boils down, armada knows their shit. it wouldn't be recommended there for no reason but do what you want, its all a matter of personal preference anyways. also, in one of the many alpha2 threads, someone posted an e-mail response from armada answering this exact question of debate. im not going to find it but it is out there.