Hi Ojuel,
Thanks for the update. My I suggest that you could have a blog/discussion/discord-news or something small, where you keep those interested up to date if you tweak stats, perhaps explain just a bit what got tweaked and what consequences you hope to get.
That way, if someone feels that matches get harder, etc. they can look if something changed, what changed, if it changed the way MSE wants it and leave a comment if it has any nasty sideeffects.
Example: it was tough to get a match as high mmr antag, you seemed to have tweaked it so that a higher mmr difference was possible. Then Hack got a match with difficulty 0 because he was so much higher than the raiders, then you tweaked it back a bit. It would have been nice to have one place to look up changes and discuss them, and to report problematic behaviour to.