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You have nailed it!!
I had expected a bit of loss of iso invariance. The KP is supposed to rock for high iso performance and I presumed this was from the accelerator unit. And I thought it was supposed to have an effect on iso invariance. But if the results from your tests are near enough visibly then that is all you need.
I have always noticed a certain amount of variation in results when experimenting but never one procedure noticeably worse than the other.
For me - once I had confidence in IsoIn -- my workflow now revolves around base iso in manual mode. I tend to guess exposures and set my preferences for aperture and shutter and then to chimp to see how much gap is on the right hand side of the histo. I look at that gap and think of noise rather than think about iso. It is an extremely simple workflow but is dependant on an iso invariant camera.
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