Problems maintaining speed above FL210

[timtomairways]

i went and read the Pilot Operations manual for the B767 in my Virtual Airline. wich is based on the POSKY 767.

I got this from the Abreviated climb procedure

Climb
inital rate of climb 3000ft/min at 250KIAS to 10,000ft
at 10,000 lower nose and accelerate to cruise climb of 300KIAS or greater, and climb at 1800ft/min
at FL180 reset Altimiters to standered
at FL270 reduce climb rate again to 500-1000ft/min
continue climb to cruise altitude and adgust rate of climb to not exceed Vmo. )you may find that 88%N1 equates into a level 0.80 cruise)

that may or may not help