Rohan Holtkamp at dynamic <<dynamic>>
writes:

Due to the rake on the uprights, if you were to achieve 90 degree
(vertical) pilot angle you will find the shoulders are further from the uprights
than at 45 degrees, so at full arm extension one will not effect the optimum
flare.

Hanging a little higher will be beneficial as not only are the shoulders higher
and closer to the uprights but the control frame is narrower.