KEEP YOUR WEIGHT OFF THE SECOND BIKE. try riding forward slowly.
- if you put any weight on the second bike it will start leaning over and steering against you.
- pretend you are riding one handed like you practiced, and holding a heavy bag off to the side with your other hand. lift up on that bag, don't push down.
- the second bike will be perfectly upright if you are doing this well. if it leans to one side or the other or feels like it is steering against you: briefly lift the front wheel of the second bike off the ground - this will get it back on track and keep you honest about having your weight only on the first bike.