Michael, your layout looks like you will have some fun running. DCS also likes both outside rails tied to the Common. If you visually stretch your main out 60+ feet with the dog bones on each end you would have something similar to the drawing below. Mine is buss wired with the TIU Fixed 1 tied to the left end and TI Fixed 2 tied to the right end. The dividing line is at about the center of the track based on length of track.
There's a lot more wiring information on my website. Start here Buss Wiring Page
