I just reread dave patricks aerobatics manual were he explains about finding the MAC on wings other than a rectangular shape wing.
At the time i did not understand what he was saying regarding trapazoideal shape wings with tapered wing tips. But Dicks comment's shed some light for me .
Only on a retangular shape wing were the chord at the wing root is the same as the chord at the tip, will you find that the Mac is the same distance from the Leading edge across the whole length of the wing. But on other shaped wings like on Caps, Giles and Jets the mac is calculated at the middle of the wing panel.

Dave Patrick also stated that once you find the desired mac for one wing panel, you can do the same for the other wing panel and then draw a line between the two. The CG would then be anywhere on that line.