"Maybe start with the questions, what should I try and achieve by changing the cowl flap setting?
If you understand why you move them, then asking for opinions will seem as rediculous as it really is." (Quote thingy won't work)
A very good point.
Although often we will not know when we have achieved what we set out to as the level of engine instrumentation is so crude and basic.
Warm up and taxiing for example, the instrumentation will tell you that the cowls should be closed but hard won engineering knowledge will often point to problems with closed on the ground. In the cruise with one CHT probe, where to from here?