IO,
Thanks for that.
That's pretty much what I do do. Of course even having done this, one cylinder could be lean, one rich.......one 50F ROP.....(the danger area?).....etc etc... no way of knowing. I could be cooking one cylinder. Of course I could bring the power back to 60-65% as you suggest, then I could do as I like with the red lever.
But still......there doesn't seem to be a safe way of leaning an engine for 75% power, with the typically found engine instruments.
When I eventually can afford my own aircraft, it will have all the gizmos
dp