I indeed mean a quite strong spring pulling the collective down - and hence also reducing power. Obviously reducing power without dropping the collective would result pretty rapidly in some attention-grabbing things happening. I didn't take my hand off the collective (I didn't dare!) but I'm used to not needing to apply positive pressure all the time, so if my attention was elsewhere then the collective/power would droop. By the end of the flight I was keeping an eagle eye on the indicated power so this wasn't happening (much). But I'd rather not NEED to keep an eagle eye on the power.
If this is just a matter of adjustment then that's pretty reassuring.