Instead of flattening the false bottom, consider putting a pick up tube cut at an angle (sort of like a slurpee straw) that can reach to the bottom of the cooler (without plugging the tube). I wouldn't try to flatten out the false bottom, because once it is flattened, it might lose its strength, and end up just flat on the bottom of the cooler, not allowing the necessary dead space to do what it is intended to do.
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