Initially, I'd suggesst putting the CG 1/2" forward of the wing tube. Move it back only gradually. This plane is very CG sensitive (elevator authority here is huge). You'll need to put your rudder servo as far forward as possible----as well as your Rx and ingition batteries. This plane tends to be tail heavy---so you'll probably have to move everything as far forward as possible----and might still have to add some noseweight.