I think it needs a better rudder. it needs more defection area lower. I'm tempted to cut the rudder off and build my own. now I sorta wish I wouldn't have glued in nylon hinges.
I just spent the last hour putting my slow stick back together rather then taping the cowl back together. if I brought both this plane and my mini ultra stick out, id be inclined to leave the mini contender in the back seat.