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Am I over-thinking this
Probably. The deeper sections just take a bit longer to go off, from my very limited experience. I imagine it would be more critical on surfaces that will be walked on or have underfloor heating or need to meet regs or some shit. If it were me, I'd just whack some down with a form and see what happens.
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I’ve used this stuff (for things you shouldn’t) http://www.unifloor-underlay.com/products/ecopearls.html once there’s I bit of board, weight on top it doesn’t move.
Cheers.
Annoyingly from reading it sounds like you want a SLC designed for the right depth. Cleaning has uncovered a massive fucking hole.
Am I over-thinking this, or will it matter?