It sounds like you’re trying to separate the behavior of the headphone from the head its placed on, but I don’t think this is advisable (or really even doable with simple in-situ acoustic measurements like this) because the headphone’s behavior is altered by the ear its placed on. This is why we don’t use flatplate measurements; they’re an unrealistic condition for showing how the headphone would actually behave, you need an ear load.
Yes, most other headphones produce a dip on my head, so if I compensate the MDR-MV1’s response to an average of those responses, it will show as a peak… but that doesn’t mean it has a peak, it means the others have dips.
It may be different on someone else’s head where most headphones don’t dip, but if MDR-MV1 peaked significantly on this same head, I wouldn’t say the other headphones that are measuring with no dips have dips… that is both vastly overcomplicating the interpretation and also just not actually correct when it comes to the acoustic event that is transpiring.
I think its important to reiterate that I don’t see much value in orienting the evaluation of a headphone’s response based on how it compares to other headphones, because in this case its treating the errors of the other headphones as the target.