Gents it's all very well explaining what you do in your aircraft but perhaps another question to ask is why we accelerate/clean up in a particular fashion.
Flyby and Imbracable rightly qualify their methods by reference to the all important NADP1 and NADP2.
I suppose each operator determines their SOP by reference to one or more of the following:
NADP1
NADP2
Procedure A (ICAO)
Procedure B (ICAO)
Any other's I've forgotten?
....all dependent of course on:
Aircraft performance capabilities within / outwith the manufacturer's published method
Airport specific noise abatement minimum altitudes.
All of our airlines' Ops Manual methods aren't published on a whim; they will invariably meet one or more of the above standard procedures preferred by EU Ops / FAA / JAR Ops etc. and be approved by their own governing authority.