'Star' wiring question.....

  Even though the power source is your power supply going into the TIU. The output channel say fixed One. Is capable of powering up multiple blocks of tracks or sidings. Run your output wires from the TIU to a terminal strip located sort of in the center of what your powering up. This will get you shorter wire runs to the track. Then run your paired wiring from the terminal strip to your track. The exact length doesn’t matter as far as them having to be equal length to one another. Even the paired wire can be off a little from my experiences.
One word of advice. When you get one block powered up. Don’t go any further. Stop and test your Track Signal. When your satisfied hopefully with a ten. The move on to the next section and test again. Then always go back and re test your previous work. You can wire the whole thing at once. If you don’t have a good signal. It’s a lot of work to go back and chase the issue.