Dear All...sorry for not stating the obvious...that the recommendation stems from VMCG/VMCA issues, but flying both 777/787 , the limited gradient that the 787 produces is quite notorious....in my previous outfit on the 777 we had a ballpark v2 that we used in case we thought performance was compromised and then hit toga if necessary which seldom is on the triple...
now a gradient of 100/200 fpm up to a 1000 feet only to have CON kicking in and achieve 10% more power and a 1000 fpm rate IMHO deserves further study, its just not natural, quite the opposite, steeper gradient to a 1000 feet, then accelerate to clean up...
open to corrections and comments on this