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I don't think it should be too much of a problem on the bottom as you wont have water running through the chips and then the soil.
I would possibly add some peatmoss or at least more vermiculite to that mix though to help with drainage if it seems like it packs down too easy. Because after a bunch of waterings, the soil will choke the roots if it gets too packed.
Have you tried grabbing the soil with you hand and seeing if it compacts or falls apart?
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