I shoot Beman size 400 ICS carbon arrows. Should I get the medium or the large? I have heard alot of people saying to get the large, even for carbons,for extra clerance. Also they make a deluxe ( I see they have windage and verticle elevation on it).Then then they make a Drop-tine model I saw you could adjust the windage but not the elevation on the regular Drop-tine. Is this correct? So the deluxe would be the best, because there isa way to adjust the verticle elevation? Thanks