replace the suspension arms m8 - they need to be done every few years - make sure the anti roll bar linkages are done as well
if the leg was bent then you would know about it when going over bumps
could be a sticking caliper but you would notice with smell and the state of the discs
if it was a bent driveshaft you would notice it as it would be noisy
try putting the car on full lock both left and right and put some torque into it and see if you can hear anything clicking
i would also jack the car up and check the wheel bearings for play - hands at 11 and 5 and see if you notice any play in the wheel
really you shouldn't have your tracking done unless you replaced some steering gear or the car has been shunted on that side