One of the most difficult concepts for many new to LOP to grasp is the concept of percent power. When you are running lean of peak percent power is directly related to fuel flow. So regardless of what percent power it says on the Avidyne (or ARNAV) your power LOP is dependent only on Fuel Flow.
Once you reach cruise most of us do what Marc does - The “big pull” - and that puts us in the LOP range. We then can enrich, find peak from the lean side and back off OR we can simply set the fuel flow we want. As long as all EGTs are rising while we enrich from the result of the big pull we are still in LOP territory.
The formula for knowing your percent power in the SR 22 is ( (Fuel Flow * 14.9)/310) * 100. For example, 13.5 gallons/hr gives about 65% power.
There’s lots of good info about this on the Members Side. Look especially for Gordon Feingold’s posts on “The Red Fin”