170',
Very wise words. I am in a similar place to you now, just doing line flying. I wish I was back instructing and doing check rides. I would be very wary about being put in charge of a light single without significant practice these days. I used to enjoy my own check rides but no longer.......... It just reminds me how out of practice I am.
The advice about REALLY learning about the aircraft is also right on the button, in my view.
Skills, knowledge and decision making. In practice as you "progress" your knowledge and decision-making hopefully improves, but in the helicopter business it is a struggle to keep the skill levels up.