@radar493 I would really like to help you. Which brick(s) are you using: model number, watts, etc. What's the indicated voltage on the remote when you are measuring 9 volts on the rails? Also: which loco(s) are you running with this setup? About how long is your loop, what kind of track? Any grade (incline)? These things DO matter!
If you don't want to type all this out, please take some photos or a video.
With all that being said, I totally agree with Chuck. Personally I don't like running postwar trains with the TIU in variable mode.