i worked for a major car OEM factory as a chassis engineer for a few years.
Toe (‘tracking’) has very little if any effect on pull/drift. i know this for a fact, having done literally months of work on pull/drift. i tried top limit versus bottom limit versus out of spec both ends, and it didnt make any difference to the pull/drift at all.
Cars pull left or right for many reasons, the main ones being in order of likelihood:
1. tyre pressures – have to be equal for a ‘straight’ car. i have known some garages ‘fix’ cars by letting lots of air out of one tyre to help it steer straight. not good.
2. the tyre itself – the internal contruction of the tyre can make the car wander. swapping wheels left to right can help seomtimes
3. camber. these need to be equal and opposite, ie both negative 0.5. the car will pull to the side with the least negative camber
4. castor. needs to be equal
5. other seemingly random stuff in the suspension.
if the car was perfrect before then i would be checking:
1, 3 and 4.
if i had to guess i reckon you have bent a lower control arm.
edit add – i expect someone who really does know what they are talking about will come along soon and flame me….