I had same problem with my VW Golf - garage done tracking and car still pulled to left hand side - then taken car to a place that done laser alignment to get it redone car is now spot on. Check for uneven tyre wear, also check shocks and other suspension parts just in case.
did you ever sort this? as mine pulls to the left ,but i have noticed the outer bitt of the tyre is worn... but tracking is correct as i have had it tracked 3 times thinking maybe thats the problem....
but im getting a knocking sound turning left.. maybe top mounts?
ps... nitrogen tyre inflation for bham, ,,, Costco im going to do it next week
for anything else i would avoid them but kwikfit can put nitrogen in your tyres for £1 a tyre.
i had a problem with my steering vibrating on the motorway at 70 or so. i had brand new discs and pads , correct tyre pressure and all wheels were undamaged and the problem was i originally had a buckled wheel on the front which was put on the back to reduce vibration and when a new wheel was put on the tyre wear was uneven by about 1 or 2mm max but it affected it.
I work in an accident repair centre we do full geom checks on cars all day long. After checking your tyre press and condition, would recommend checking lower front ball joints and inner bushes for any play.If these seem ok then your only answer is a 4 wheel alignment check ,you will prob have a bent steering component throwing out a caster or camber reading.The damage is prob so slight the chances of you actually seeing it are impossible.