I have no idea nor interest in what the lambda is, because I know, from first hand measurements of the EGT and CHT of each cylinder, where each cylinder is on the lean curve, and I know what to do to put and keep each cylinder where I want it to be on the lean curve, to get the power and efficiency I need for various phases of flight.
But that’s not the point: Remember – I have no clue what I’m doing. Many years and hours behind an engine that I’m incompetently managing, and the lack of cookd clys has been mere luck. The cool CHTs have been a product of the cooling effect of the lead on the valves and the unicorn fart additives in the oil.
I’m just fascinated to know what it is you propose to actually do about your concerns, and how you will be able to work out whether your concerns have actually been addressed. Presumably as some stage you’ll be sitting in a cockpit in proximity to a reciprocating engine, with some knobs to play with and some dials to watch.