I think what hands_on123 is meaning, is that if you are in a hover for instance, and you apply carb heat, there is a reduction in power, and helo will sink, but if you apply more power to hold height, you will be hovering at a higher power setting to maintain hover height. Please correct me if im wrong, im tired and grumpy, having had 3 weeks of SH*T weather I havnt flown much.
Also, cholmondeley maybe at the first flight there was not much wind, and then maybe the wind picked up so you benefited from translational lift, so you got an increase in lift for no increase in power, causing helo to climb, so you needed to reduce the power setting to hold height.
Preparing to duck.
Hughesy