Tyre wear

Hello guys, so that a front-driver at the front wears the tyres more than at the rear is clear but not like mine. 6000 km driven and only 5 mm in front on it. Is that normal, or do you have other experiences. Can one have a new adjustment with track and fall achieve improvements ? I have specially picked out the tyres from the ADAC test which are reasonably inexpensive from the good a) and b) have best marks in wear. But did not help anything. Maloya tyres I have back are still 7mm on it. as I said for 6000 km a bit happy for my taste