I think there is a bit of "tolerance" in the build of the earlier cars chassis in particular. I originally installed the Empire kit on my 2013 (chassis number 799) and adjusted to 1.5 degrees negative camber without any problem. Both sides were not adjusted exactly the same so there was a small lack of symmetry in the chassis. Following a chassis change late last year, to a 2015 spec, I had to cut about 4 mm off the threaded end of the Empire upper wishbones to get close to 1.5 degrees on full adjustment. There is plenty of metal there for this. Both sides are about the same adjustment on the new chassis. The Empire kit was built for Pauls pre 2014 M3W and it seems not all of the chassis are (or were) exactly the same.