After wheel alignment mechanic tried to do something with steering via ISTA - D and in another shop with Hunter alignment machine they tried to solve it with CodeLink which is Hunter's system to measure steering angle sensors positioning and reset the sensor referenced to a vehicle’s alignment geometry. Both failed. But at the end on CodeLink there was a message with error codes found after job saying EPS: 4823C2 and DSC: D354A1. For 4823C2 i found this meaning "initialisation fault, steering angle, directional stability not learned". I heard that this pulling after lowering happened to some people with MINIs. My car is only few months old so maybe I would try to ask dealer if they can diagnose it, but don't know how they reaction will be about lowering springs.
I would like to stay in contact with you Sam, I am going to the MINI dealer maybe in 2 or 3 weeks so if there will be a solution for this, I will write it down right here to let everybody know.
For those who just read it, please if you know something about it or somebody who solved it, let us know. Don't let us stuggling.