Hello. I am building a hanger 9 showtime 4d and my CG is approx. 1 inch too far to the rear. As per the instruction manual. Is this close enough or should I add lead weight to the front? I would like to keep it as light as posible. Moving my battery pack is not an option as they have a recess for it already. Any advice on CG would [8D]be greatly appreciated. Thank you in advance for the help.