have you got the "bottom of wing to footwell brackets" in place ????
they are basically a bar that goes from the bottom of the wing ,at the bulkhead side of the wing ,to the bottom of the footwell .
mine is missing them and it has allowed the bottom of the wing to spread outwards ,and at the same time allowed the top middle of the wing to sag .
difficult to explain ,but the inner/outer wing assembly should act like a box ,but it is weakened by the hole for the wheel ,and needs the extra support of the brackets ,to stay rigid