Your frequency response graphs in the POST folder show a pretty big valley between 4kHz and 9kHz which is probably why they sound so muffled. As to what caused that dip, there's no way for us to know for sure. I would assume that it's due to mic placement though and the only way to sort that out is through trial and error, unfortunately.
Are you doing the full 7.1 every time you make a measurement? I'd recommend just doing normal stereo measurements with just the front left and front right speakers while you are experimenting. I can't imagine that doing full surround measurements is a quick process when using one speaker, but if it is then ignore that recommendation.
Try out different depths systematically, if you can. One thing that I did after about 60 different measurements, instead of being smart and doing it early on, is to make 3 measurements in a session at different mic depths. Starting with the mics inserted as far as possible without serious discomfort and then pulling the mic out a little bit at a time for the following measurements, so I ended up with a deep measurement, a medium depth one, and then a shallow measurement. I then tried out all three and greatly preferred the deepest one. That might not be the case for everyone though and the only way to find out is to try it. Unfortunately this is the hard part about using Impulcifer due to the fact that everyone's ears are different and the mics aren't purpose-built for this kind of thing and they are very easy to accidentally obstruct due to their size. You might also want to try changing the path of the mic cables, too. The cable is pretty thick on these mics compared to the structure of the ear so if you normally wrap the cable up and over the ear like one typically does with IEMs then maybe try having them hang loose straight towards the ground like one would earbuds instead and see if that makes any difference.
The furthest I've gotten into programming is making Autohotkey scripts to make my life easier, but I'd be willing to try this out if I knew how to use it. Would I just paste all of this into a text file or something?
yea i was doing the whole 7.1 measurements every time, i will try the stereo then... do i have to switch to stereo in the windows audio properties or i can keep 7.1?
It's not easy for me doing what you suggested, the ear plugs pushes back out little by little from themselves, also i noticed that my left canal is more tight so it's everytime a pain
i really don't think that the curve from 4khz to 9khz is the problem here, my old test 11 also have those valleys but doesn't sound this muffled, also i tried multiple positions and i found out that my best clarity/spacial is around 3ft, but now i'm facing this weird problem, i did one more test today that's the last due to the late hour, i think the ear foam wasn't the cause, tomorro i will do again the test following the same route i did for the test 11, i will see
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