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Block off the joist and that will add in a fair amount of support and it may even eliminate bounce. If you already screwed down the plywood, just set tile on top. It should be OK. If not, go down there pour a 14x14" 18" deep concrete pad ( or just a pier from home depot) and a girder. A 4x4 is plenty if it is a small bath. It will completely remove any bounce
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