So i'm taking my car into get looked at by an independant mechanic as the dealership i have the warranty with are getting nowhere....

The car is all good alignment wise according to the printout everything in the green, only thing it doesnt show is the caster, but i have a feeling it is okay because my car does drive straight sometimes.

It isnt tyre wear or tyre pull as it isn't a constant and varies too much i believe for it to be tyre related, all tyres are set to the door frame recommendations.

So the issue basically is the car can drive perfectly straight but a decent bump on the road can through it out, sometimes it will want to pull left.... other times it will want to steer to the right, and other times i can hold the steering wheel dead centre and it will go pretty much straight.

Whatever it is i can actually feel the shift when it happens, by the contact of the tyres/ how the car sits...

I am also so intune with the issue that as soon as i step into my parked car i can know if it is going to drive straight.

If i had to describe how it feels, it's like the affected side feels heavier.. when i'm cornering if its on the lfront passengers side (uk) and im taking a right corner... it feels heavy on the front passengers side and wants to pull away from the way im turning constantly..... and vice versa when it shifts.

there is also a very subtle knocking noise when going over speed bumps when both front wheels roll over it, doesn't happen going over with one wheel.

any tips what to check for tommorow with the mechanic ? i have a feeling it might be subframe movement because of the twisted feeling/heaviness on one side.. do the symptoms add up ?