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No, Im happy with Es in the 20s. Lower is better but chasing it is an exercise in diminishing returns. SD in single figures is good but again it can be futile chasing it. .
And to quantify, I...

:D You know thats not true, there is always; more yards, smaller plates , bigger guns and more money to spend so there is no "happy"

Mate I think your questions are a little scattered. You're worried about temp induced velocity change which is a small part of a big picture, yet seem to be at the very beginning of load development....

Ok. Im not saying that looking for a flat spot in the velocity wont be good place to start, I am saying you cant find it with a single shot per charge weight. You might fluke it but getting really...

Mate you are not looking at this subjectively. Its part of the human condition when you want something to work to then ignore basic principals to get the outcome you want.
You are claiming here...

Yes if Im testing for temp /velocity diferential its both the rifle and ammo at the required temp. I cant confirm if its anymore relevant but I think it is rules out another variable.
I remember...

If its not a top end chrony you are wasting your time. Same as this 10 shot theory. You might as well just pick a random powder charge.
A lot of loads will give you an ES of 30-40 fps over three...