The main reason I asked you to use a longer level, is that it measures more of a space and tells a better picture. Like a water level.
Anyway, with 1/4 bubble using a small level tells alot. You do have quite a slope.
Again, without seeing the floor and your conditions, I would strongly recommend using a vinyl tile again. It does flex to an extent as wood will not.
You really don't know if your foundations has ceased moving.
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