How are you measuring the scale length?

That extra 4mm could be coming from a saddle being too far back (away from neck). Your final bridge position should be determined by the E1 (treble) saddle which is the farthest forward saddle (closest to neck) 99% of the time. There are also other considerations, but the high E saddle is the first step.

Setting scale length is discussed in numerous threads through out the forum.