chassis is bent check the inner part of the bay where the tca bolts on to for creases in the metal flaking paint ect.
if you think about it the cabs have no roof which means less stength to support the car as you probally have seen for yourself when you drive the car with the roof down.
i have had the same problem with mine unless you get it jigged fit all the adjustable stuff and a strut brace to make the car stiffer.
with my car as i take a sharp left at speed the cv joint pulls itself half out of the female bit in the gearbox and sends out this terrible grinding noise so i have gone all adjustable to sort it out.
plus with adjustable tcas you can sort the camber out so that you can virtually eliminate inner tyre wear and reduce torque steer if you have a turbo engine in it like mine