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Julian isn't here to defend this, throttle stop testing is like coast down testing, susceptible to environmental effects. Doing multiple consecutive A-B runs a few minutes apart will mean that the wind is likely to be the same for all tests or at least averaged.
So from your data, we can say that multiple consecutive A-B runs on a warmed up car has no issues other than pumping losses.
Pumping losses depend on the engine, a six cylinder has virtually no pumping losses due to constant crankcase volume. But even if the pumping loss increase is there, it is a very small, virtually insignificant amount increase of the total drag and even then you need to have a reduction in aero/rolling drag to get the engine speed to increase. So it may not be accurate to 1% but I think it is more reliable than coast down tests.
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