Looks awesome good to see progress, I used 2x2s 24" on center with ridge foam, then covered it with 3/4" TG OSB. I am a big guy and zero problems with floor flex. The OP looks like he used 2x4s 12" on center with maybe 1/2" osb, I don't see the OP having any problems with floor flex. Just lots of fun cutting all that ridge foam to narrow strips.
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