Sounds like a Mathews problem not an Octane problem. LOL I'm just kidding.
You say it doesn't fit the holes? Does Mathews make theirs special for a 2 piece? I know when I shot Hoyt their holes had a triangle around them for their own 2 piece quiver. Does Mathews do something similar? And when you say loose, the actual bolt through the hole or the bolt wont tighten down all the way?