Those are pretty small planes.3D becomes much easier on a larger light airframe,but then it's better motor... better servos...There are some foamies that 3D well like an Airfoilz and absolutely can fly extreme without a hefty expense.There are many inputs that affect the Harrier.Pay attention to your throttle,just a click up or down makes a huge difference,and you will need 45 degrees of elevator throw if possible,and a CG that is shifted rearward.