Multiplayer Dimension Support

So I made the mistake of changing the alternate dimension support dial to .5 mid game after covering over half of a 10k x 10k play area. This was fine at first because when I switched to the main lobby it would generate separately and when I go back into the world it would use the other LOD.
After opening it the next day I realized that it had in fact thrown out both LODs to what I can only assume is start anew to make a clear difference between dimensions despite the mod already making that distinction just fine yesterday?
If there's any way I can assign the old LOD file to the correct overworld that would be great but if not I just want to be able to get it back again. I don't want to spend 5 weeks of my spare time filling out chunks again.
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