good news

I tested your saves and didn't have one single crash.
which means, whatever it is, at last it doesn't affect your savegames
I have no idea why exactly this region would cause these problems,
but I'd suggest you reinstall Nehrim and try playing without all these stabilizers - at least in the beginning.
if that doesn't work you might have to reinstall both (first Oblivion, then Nehrim), to have a clean system :/
(although I
think it shouldn't make much of a difference, if you followed the instructions

)
what Oblivion-Version do you have btw?
Steam or retail?