It's like shifting gears in a car.
high rpm = low gears
low rpm = high gears
driving uphill = climbing
driving downhill = diving
In that sense, if i want to pick up speed in a dive i'll do what i do in a car to accelerate when driving downhill: step on the gas pedal and shift to a higher gear = increase throttle and decrease RPM
However, if i want to make sure i don't go too fast in the dive i'll do what i do in a car if i want to go slower: let go of the gas pedal, shift to a lower gear and let it act as a brake as the car rolls downhill = pull the throttle back and set pitch for increased RPM
In other words, if you want to get good performance in a dogfight you'll have to keep changing the prop pitch all the time. Otherwise you might get poor acceleration in a dive or reduced climb rate and it can get you killed.
Hope it helps.
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