Well, it seems that everyone is correct regarding this point. Height can place an Amazon into a dominant position and present issues regarding requests from the Human. That said, it really comes back to incomplete training and how well Step-Up has been established. Properly trained, Step-Up should occur regardless of the height position of the Amazon.
Step-Up is something that is not once trained and than move onto other training. It needs to be reinforced repeatedly month after month, year after year. If a Step-Up does not occur, it is your fault, not the Amazons fault. Many other behavior responses can be traced back to the loss of Step-Up control.
The Step-Up request is critical in and of itself! Yes, it sets the foundation for all other training. But more importantly,'when' you must move your Parrot (Example: Emergencies, Medical, Fire, etc...), regardless of your emotional state or the Amazon's he will Step-Up!
Getting an Amazon to Step-Up, as part of you're normal working with your Parrot, starts as does everything, with you observing your Amazon. If your Amazon is Sleeping, out in the AmaZone (possible day dreaming), playing, etc... You need to assure that you have the attention of your Amazon as you are moving to them from across the room or the house. As you get closer you should be communicating with your Amazon to set the stage for a Step-Up, i.e. Okay Now, We Need to Move, etc... Now once in front of your Amazon, you need to clearly state: Step-Up!
Humans tend to stray away from a clear Step-Up and are surprised when the Amazon does not Step-Up!
Verbal Rewards should always follow the Step-Up! Once again, Humans tend to stray away from the Verbal Reward!
Training does not start when you are in trouble, that's too late.
1. Assure that you have the attention of your Amazon!
2. Communicate that a Step-Up is coming (do not use Step-Up from across the room)!
3. Once in front of the Amazon, clearly state: Step-Up!
4. Verbally Reward the Step-Up!
That is the foundation for training and the request!!!