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If bolting direct into the joist I would use 3/8 RSS Structural screws, should be available by the piece at a lumber store vs lag bolts. But, about the extra 150lbs on each joist you are possibly pushing your luck a little there, I'm sure you do not want to open the ceiling but doubling up another 2x8 is probably a good idea. Where is the load in relation to the ends of those joists? What is directly above the location you are installing this?
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87 930,
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