Not to try and derail, but…
That’s one easily worked around at least. First thing you should do for any old OF is yeeting the aho.class xdelta/md5 patch from the OF jar (or full shipped aho.class if your OF version is really old), since that’s responsible for the weird OF spawn rules…
And maybe use Optinerf if you’re playing SP, to undo OF breaking same-dimension entities like thaumcraft golems when you’re far away. 
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