you got a bit more then the 0.002 i can still see on my x4, when tightening the gibs try pushing up and backward on the head while tightening i was able to tight the gibs about a quarter turn on mine doing so, also lapping the gibs abit helped on mine, originally mine had about 30% of contact i would recommend lapping it until you get anything in between 75%-90% but not 100% you want to leave space for oil in it, mine were actually convexe in the narrow part of the gibs that was in contact with the dovetail :nono:
The opinions expressed in this post are my own. -Les opinions exprimé dans ce messages sont les mienne