well,,, you said it pulls to the left,,,, then you said it "Still" pulls to the right
so,,, whichever way it pulls , i`d be looking at the steering arm,,, or the rack,,, or both
the steering arms are bolted to the swivel hubs with 2x bolts (ontop of the hub)
the rack could have a worn bush in the laft hand end , or a sloppy pinion assy in the right hand end,,, or maybe even the ball-sockets (in the end of the rack-shaft, & the start of the tie-rods)
you probably need to look at it a bit harder,,, all these things i`ve listed are very common mini problems these days
have fun & be careful who you take your mini to for a wheel alignment, heaps of "so called" specialists have absolutely no idea how to set-up a mini properly... let alone know what they`re looking at

much like yourself
