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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
When you re-level it this time, use a long spirit level (I use a 4 metre one) to check for dips. Don't put anything down until you know it's flat. And make sure you buy enough levelling compound this time!
Failing that, ignore it.
If you've made your mind up good luck with it, in theory it'll work. I understand you can't lift the floor, it'd probably give you a mental breakdown anyway after all your hard graft. I'd inject it slowly, a bit at a time, until there's no more flex in the joint (but you know that anyway). Let us know how you get on. Good luck.
Apologies for contradicting but do not inject it a bit at a time or press on it. A pouring epoxy in your best bet if you are going to try this method. As the epoxy will flow (which is good for filling) however if you press on it it will tell you nothing about how full it is but will squeeze epoxy under the level floor worsening your problems. Also if you fill it bit by bit without a steady flow there is every chance the epoxy will start to seal the hole leaving unable to do any more.
If you do end up removing the board, mark a line down the centre of the length. Cut through the board to within about 3'' of either end. Then from the end on that line cut diagonally towards the 4 corners as close as you can get with damaging the neighbouring boards. There will then be enough movement to snap the board out.
Offset "(Emp) - a little heavy on the hyperbole."