Hello weaponslayer!
If I were you, I'd put the Fra.esp to the nearly top, directly under the DLCShiveringIsles.esp; like it's recommended in this thread's first post. Though, I don't know whether this will resolve the problem, but why don't you try? (Well, I'm sure in the worst case you won't try for about 100 hours, but maybe, you won't need to wait that long)
Otherwise, I'd advise the
Crash Prevention System, it may work...
By the way... Why do you only use German mods (probably with the German game itself), when you can't write in German?