This isn't TI but it helped me out immensley finding balance
(forget about swimming for a while and devote practice time to the TI balance & streamline drills or work on the richard quick stuff below)
When you get it just add in the arms and legs and you'll understand.

"The last thing were concerned about is what the arms & legs are doing"

https://youtu.be/YwOHzq8Qgso