How about this:
Adopt and maintain an accelerative attitude (don't forget the flapback!).
Increase collective pitch by the amount necessary to prevent descent, whilst simultaneously applying pedal as necessary to keep the string/ball in the centre.
When your target speed is reached, re-adopt attitude as necessary to maintain this new speed, and reduce power to prevent climb, applying pedal as necessary to keep the string/ball in the centre.
Try it and see how it works.
Disclaimer:
No liability accepted for this radical approach to attitude and power changes.
E&OE