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consider using a plate above the joists and running threaded rod to that. It may cost more, but I am sure that your safety factor will be raised. The other thing to remember is the tensile vs shear. Use lags in shear if possible. I have had boards splinter off the portion that I was screwed into without pulling the threads out. Running threaded rod to a piece of 2x10 laying flat across the joists with fender washers distributing the load on the wood would be significantly safer (IMHO, although I am sure that it could be proven).
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