TLR 22 Chassis, issue?

[DCM]

Right, ever since I have had my 22, it has always been a little wayward on the rear and aggressive on the front end. I have tried lots of things to try and remedy it, but all to no avail, so I have come to a conclusion that it must be the car at issue, not the setup.

I stripped the car back of all components and decided to put a straight edge on my chassis, front to rear, side to side, and diagonally. Seems there is an issue, and would like to ask if others could check theirs please.

What I found, from front to rear, the chassis bows up in the middle by about 1.5mm and only really drops down where you have the chassis bend for the front kick up and the joggle at the rear to lift the chassis.