By the way, about the tall angle possible when fully extending the 'foot': most office workers that I see as I tour around various offices have a very tall desk and a very low chair, similar to the height of dining tables and chairs you might find at a restaurant (or for eating in someone’s home).
With a desk and chair like that, the fully tilted AEK II is actually just about the right tilt.
Obviously if you set the keyboard on your lap, or on a low desk, less tilted becomes better. (If the keyboard is placed low enough, it even becomes helpful to prop something in front of the board to cancel the built-in tilt.)