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With all due respect as I know you are an expert in engines and you do that for a living, there are a few things which are just plain wrong.
1. Why would wheels and tires matter if a stock baseline is established where equality is established? I agree if no stock runs were established than this would be a bare minimum but for whatever reason, one car may be a bit faster than the other but maybe its heavier wheels will equalize it to the slightly slower car with stock wheels or vice versa (just an example). The bottom line is if they can establish equal stock runs than all of that stuff does not matter.
If during a stock run, one car is faster than the other than they need to equalize the stock runs. Maybe adding a passenger in the faster car or adding weight etc.
But once stock is equality is determined than none of those variables matter and there is absoolutely no need for someone to change their wheels and tires. You need to start looking at the end metric here which is at these speeds whether the two cars run side-by side. "how" they do it is irrelevent in terms of one may be heavier than the other. You are getting caught in the fine details and missing the big picture.
2. Running through a few tanks of gas to have them adapt? The cars fully adapt after a couple pulls of full throttle. That makes no sense that it would take even one full tank for an advanced ionic knock system to finally adapt to timing. it would defeat the purpose. Its able to adapt within a run or two to maximize timing and maximize engine output for all variables. Adaptations happen within pulls, they don't happen over tanks of gas.
Again you are creating problems here that complicate this but don't even contribute to being more accurate.
The only important thing is the cars having the same mods in terms of response to tuning. Catless setup really is the only one that matters (or HFC) which both have. That really is the only factor that a tune may respond differently to. Besides octane which I agree is a huge factor as hitting the timing targets of a tune with a car down on octane would potentially prevent the car from getting as much out of a tune as a car with higher octane. So catless setup and equal octane is the only two factors in addition to equal stock runs that matters. You could put 5 pound wheels on one car with 2 passengers and it may be equal to a stock wheel car with no passengers and as long as you are only changing the ECU/tune variable given same octane nad catless, than it does not change the metric of whether the tune is adding x amount of hp
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