Is this correct?

[phoenix1963]

In RL, Merlin pilots would set their RPM to 2800-3000 prior to combat.
The point is that 2600 rpm IS about optimal for thrust, but if you momentarily slow down (e.g. in a combat turn), 3000 rpm gives you (non-steady-state) an edge in unplanned slow manoeuvers.
It's a sort of insurance policy!

56RAF_phoenix