'self imposed company limit'
Why do you consider it a self-imposed limit? The regulations call for 2.1%, however, the MAP requires at least 2.5%, if you intend to follow the MAP, then surely this 2.5% becomes a legal limit rather than a self imposed limit?
Bally Heck
which will typically be 10% or 20% below MTOW
I presume that you are talking about the 757/767 in particular? What temperature are you talking about for the 5% at MLW?
Mutt.