[SamUK]

Have you checked the hub ball joints and wheel bearings for excessive play?

 

[SamUK]

Hmm.. You'll have to take some measurements and see what's up. Something is a miss. Not just an out of shape tyre or a different pressure causing it is it?

 

[SamUK]

Any pictures might help for users to see, some of the guys on here have a very keen eye and are pretty hot at spotting a fault.