Intended fix is as simple as turning line 55 in the Omnifactory/config/cofh/core/common.cfg file to false. As discussed this will just re-enable all enchantments (including redundant ones) because we don't want to rock the boat now that the pack is released.

For some reason, it was set to TRUE (thus disabling enchantments) since the release, but it didn't register until you updated CoFH mods, most likely due to this commit: CoFH/CoFHCore@825e84f

So case of two wrongs made a right, until it was corrected to only one wrong.

Here's a pastebin of the correct config file: https://pastebin.com/g3ij2DRf

done