lifesabeach01

So i have been shooting carbon express mutiny very well got my new sight all sighted in and everything. I decided to give the carbon express mayhems a try today. (Both are the 350) they seem to be all over the place. I was expecting them to shoot high because they are faster but I can not get them dialed in. Im sticking woth the mutinys but does anyone have any idea why these are so erratic. I shoot 3 mutiny all center about 3" group. I shoot 3 mayhems they are all over the target no order. I go back to the mutiny and im back to a 3" group. The fletchong is shorter on the mayhem and they deff hot the target alot harder as they have been going straight through the target. Any help is much appreciated.