Thank you for sharig this VJ.
Other Orelo owners can add?
As you can see at least I (or even I) have much to contribute. I guess I work differently for approach were it about the F-M settings. So, for me as the designer of it, I take it for granted that green-green-green should be the normal position/curve, never mind it is not the curve which Mr Fletcher and Munson found out for us human beings.
Still it is so that "by nature" I worked with and the dip and the highs to say orange up to red (Dip) and red (Highs respectively. So what I do today is starting out with green-green-green (flat curve) and will soon notice that something has to change, which highly depends on the music. Often it's the dip to orange first (nore Dip) and later I might set the Highs to orange (more highs). This latter could be a "compensating" matter.
Most of the time I work with "disturbance". So, when I feel things are not right, I will change e.g. like described. This can last for days until something disturbs again, and with the Dip to orange this undoubtedly will be about a too flat sound, or to dull. I now do not set the Highs to red (even more Highs) but undo the Dip (so set to green). Next, in rare occasions I may find the highs too much (too less color in them), but when so, they get back to green (flat).
This looks to be a cyclic happening.
It is very clear though that the Dip being activated takes out the higher frequency ambience of e.g. a full orchestra. This can be a matter of life and death so to speak. Let's say how all gets full with air when the dip is set to green, back from orange. In the end such phenomenon will always be the case, but for some recordings it can be too much of it but hard to describe how (now from the top of my head). Possibly too much sibilant.
Fact is that my cyclic happening mostly last for days for one setting. Meaning : it takes days to run into an album which makes me change the settings (back).
I can also say that only in very rare occasions I change a setting but change it back within a minute. This means that most of the time I guessed right where it needed to go to. And in those rare occasions I guess wrongly, I guess I throw out the album and hunt for another (read : can't be helped).
So see ? I am not looking for the best settings; I look for settings which disturb least and this is quite tolerant (or otherwise how can any setting last for many days, no matter what direction it went).
Imaging itself I never explicitly pay attention to. However, my mentioned "air ambience" is about how all gets more separated. You can call it more accurate. So this changes the image largely, up to the orchestra suddenly "working" while before it wouldn't (get involved etc.). The image will get wider of that, but this is not what I seek. The separation, yes.