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musa
Here's a thought: would multiple layers of compacted underlay form a better and more flexible filler for the bit that comes from the high concrete down to the low boards? I'm paranoid that the few inches around that area could be weaker if it's just badly scribed hardboard laid on top (i.e. put a chair leg on it and it cracks because there's nothing underneath in the void? What about lots of layers of thin underlay and then 3-6mm hardboard over the whole thing with the cork panels on top?