Yes, i fly the Q400. We use reduced take-off pwr as often as possible, usually max reduction which is 81% torque. Normal climb is with power levers in detent, MCL and 850 RPM. Climb is up to PF, but below 7 degrees nose-up after cabin crew has startet service and steeper with tailwind, faster against headwind etc.
Regarding cruise speed, the sectors are usually planned with so tight schedules that you are happy if you can arrive a little early. When flying on legs originally planned on 300 we use long range cruise and still arrive early.
Landings are usually with flap 15 and reduced NP, i think this is an option, so 850 RPM for landing.
Extra fuel carried is usually 15-35 minutes depending on weather.
I seems Bombardier also hasnīt taken into consideration the performance of the Q400 because performance figures should have been included in the FMS enabling a profile mode.
Rgds