so what speed do I specify? speeds pilots are happy to fly differ for each B738 I talk to nevermind other types.
300kts? 290kts? The actual speed makes no difference aslong as its one you know the aircraft can fly. The point is "maintain high speed" could mean 260kts to the first one when the one behind is doing 300kts. If you tell the first one 290kts or greater and the second 290kts or less then they'll never be a problem.