A couple things, the 70 knots for the R44 is definitely a speed based on moderation, a mix of reduced rate of descent, good range, and good inertia.
If your forced landing area is short, you won't want that much speed anyway in the flare. Also be aware that the higher the power setting in the climb, the faster you will lose that RRPM in an engine failure situation. I recommend trying a couple autos in the various departure conditions during your company training, it will be a good eye opener.
Myself, it was best rate of climb over hostile terrain, moderate power cruise climb over good terrain once above 300-500 feet, and always a good plan for what speed and direction would be needed if the engine did falter.
Good luck.