David,
Follow Barry's advise as you build and use the 12 track discipline as you build, testing your track signal as you construct your layout. When I used 711/072 swiches thru out my FasTrack layout I would place a lighted lock on in front of many of my switches to assure the signal strength was kept at all 10's. I learned later to just ignore the readings around the switches in most cases, and make sure the complete layout over all, ran with as close to 10's as I could get. In this way everything work out perfectly, and the trains ran like glass on my FasTrack.
PCRR/Dave
The DSS rule applies, for DCS signal strength - Don't Sweat the Switches!
The layout you see below had 18 sets of 711/072 switches on 4 different levels the signal strength because I used Barry's building advise and the 12 track discipline rule ran with 10's thru out.