We balanced 9 times in matches (two CP bridges) and 4 times on the practice field.
he best strategy seemed to have the first team lay off the controls completely and the other team push them up the bridge. What seemed to work best was releasing the controls the second the bridge began to tip and it would center itself.
Balancing while both teams are moving is next to impossible.
Video Example:
Balance starts at 1:20 and ends at 1:35.