+1 to the above post, i use somewhat similar settings and i found them out simply by experimenting in free flight. It can easily make 500km/h IAS at low altitudes on combat power settings and can also easily cruise at or above 400km/h IAS with 1.2 Ata and the pitch indicator at the 10:10 position.
An easy analogy to remember is that it works like shifting gears in a manual transmission car, lower RPM is like higher gears and higher RPM is lower gears. This means that to get the most speed in a dive or in level flight you actually have to lower the RPMs a bit (go to a higher gear). If on the other hand you want to limit your speed in the dive, pull the throttle a bit back and increase the RPMs, the blades will meet the air in more of a "flat" way but since the engine is throttle back they are semi-windmilling and this acts as an airbrake.
In a similar fashion, higher RPM means lower top speeds but faster response to throttle changes, so you increase them in the climb as your speed drops (it's like shifting down a gear and pressing the gas pedal to climb over a hill in your car).
I've found the useful powerband to be between 2100 and 2600 RPM (just don't exceed 2500 for too much time), i don't know if this corresponds to historical values and how much more i could improve it but it certainly seems to leave everything in the dust if flown like that so it works good enough for the time being.
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