FS2004 - PMDG MD-11 FMS

First, I am a newbie with some experience...However, I just setup the FMS using FSBuild with the FAA approved flight plans from KIND to KCVG...using SIDS and STARS on the MD-11...I was flying at the recommended ALT. I noticed there was a difference from the actual FS-2004 and the map on the FMS screen...In other words I had to adjust all the "STAR" crossings about 1000 ft lower than the charts to make an approach into 18L at KCVG for autoland..It seems I read somewhere in the early materials (can't put a finger on it) that you had to make a ten mile or so difference from the actual charts to setup the modern FMS properly...Hope I explained this ok...Need some practical experience to see if others have had this problem, and if this was the problem what did you do to solve it...Robert Adams FDX183