Ok I don't intend to get into a discussion with someone who isn't listening.
So far, you've just proven everything that I've said. You're doing things zealously and with a DMM and a microphone (have you seen the stuff arnaud models with a simulated head/listening test environment?). Really? Worse, the graphs which show how things perform are created by KG. For someone who loves to measure, you're also not even consistent with what you're doing.
So what are you trying to explore? The outputs of the RKV amplifier when different step-up transformers are paired to it? Why not measure what's at the output of the transformers (I mean that's what you're using to power your headphones?) You don't expect the various transformers (built to a cost) to be perfect do you? You're also not able to measure distortion from the transformers (which I would think is a major factor since you're talking about how great it sounds?) And why can't you even keep the test parameters consistent (why all the different output voltages from your amplifier? Cherry picking the voltages that will make your case look better?)
So what has your measurements accomplished except give more questions than answers? I really don't get it, I'm just some guy who derives enjoyment from things I've built (better if it performs well against commercial products). Don't worry, I won't be responding to your future posts. I'm pulling the same line from you "Megatron is the ****z. Period."