I balance my gimbal fore, aft, starboard & port using titanium 2gram weights that are meant for balancing golf clubs. I bought them on Amazon and they were very reasonable. I attach them with a strip of micro-thin velcro that is placed just aft of the lens release button and runs from inside the gimbal arms on each side. The velcro is attached with the soft side on the camera body itself. The weights themselves have the prickly side of the velcro glued to the backs. The velcro strip on the camera body is about 3/8" wide or just wide enough to hold the weights. This I find gives me any combination and in any area that I need weight to obtain an exact and perfect balance in all directions. I shoot with the OLY 12mm, 17mm, 25mm, and 45mm. I bought the DJI 15mm with my X5. I find that if I balance the camera/lens combination with everything I am going to shoot with ,such as Polarizers, variable ND filters, hoods, etc., it sits perfectly level sitting beneath the gimbal itself and does not slump in any direction. I level and balance the unit off the I1 supporting it at the attachment point arm that secures it to the aircraft and hold it at eye level so I can observe the pitch. This sounds like a real hassle but I've learned where they go for each lens and it all comes together quickly. I also have glued a 1" square piece of velcro to the flat metal back of the camera body incase I may need a little extra weight there. My thinking is this..., In order for the gimbal to produce the smoothest movements, it must be working with the least amount of effort. If it's fighting an unequal weight balance, it has to work a lot harder to do it's thing and try to maintain a level lens. Fighting a nose heavy or nose light camera lens puta a lot of stress on the gimbal motors trying to maintain camera lens direction. Simple physics. I usually always fly with my variable ND filter B&W, $225.00, if it's daylight or dusk because I can dial in the manual exposure that I want by adjusting the amount of light entering the lens. Works perfectly for me and it one of those few things that has added to my video work improving dramatically.