Just from skimming their page it seems like both this mod and Mihail's alter the same creature, so they're incompatible. Which ever one loads last will be the one that affects the summon in your game. Just choose whichever version you prefer :-)
Not entirely sure about this interaction but it was probably because they were hostile to everyone previously. If so, then companions should stop attacking them now.
Is this included in the Unofficial Skyrim Special Edition Patch? I'm not sure if the Fire Wyrm was intentionally set to cap at level 11, thus it might be possible it is edited by that mod.
Summoned Fire Wyrms should no longer be hostile toward the Lost Souls in the Soul Cairn. (Bug #13990) Is the only mention of "Wyrm" I could find in the USSEP changelog. The low level cap seems to be intentional, for balancing purposes.
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Just choose whichever version you prefer :-)
Edit:
I take it back. The wyrms will pursue enemies over short areas.
Summoned Fire Wyrms should no longer be hostile toward the Lost Souls in the Soul Cairn. (Bug #13990)
Is the only mention of "Wyrm" I could find in the USSEP changelog. The low level cap seems to be intentional, for balancing purposes.