Good morning again:
I have a few spare moments so will make a few short comments regarding engine handling.
I have worked all my career as a pilot / mechanic and during the past fifty years have made many observations and learned many lessons by making mistakes.
When operating any aircraft engine you should first read the manufacturers recommendations for that engine and model number.
Three main factors contribute to wear in an engine.
(1) Piston travel
(2) Thermal spikes and or overheat
(3) Bearing and moving parts reverse load changes..
So when operating the engine controls you should strive to move the throttle as smoothly and slowly as practible for any given power change.
As well remember that the lower the OAT the faster the temperature drop will be when reducing power.
That is about as simple as I can describe engine handling.
P.S.
Note number one piston travel, remember that one when advancing prop RPM especially during the approach and landing.
I leave the RPM at cruise setting during the approach and landing, when the throttle / s are closed for the touch down is when the prop control is moved to full fine.
Chuck