I just droped off my martin (slayer)? brand new at the bow shop to be adjusted and they say that the bow is all the way backed out and it is pulling at 72 lbs when it should be at 55 when its all the way backed out. he thinks the string is not right or something, he says the screws wont tighten any more to un back it out, the limbs arent in the slots all the way he says, is he doing something wrong or is it possible there is something not set up right, right out of the factory?