wait,... what??
i thought YOU were testing this already.
as i said many times before the smaller rain in gfo will not work if PE4 or ENV 5 is used (i provided a patch to fix it for real environments)
its a very minor detail you may not even notice but thats the only conflict with those environmental mods, now as i understand it the ISE mod goes way beyond the environmental files and makes other changes so i dont know what conflicts exist with that mod and gfo
hope that answers your questions