An MD83 with a full passenger load, especially if majority were adults with few children, has no hope of taking a full bag load as well on that sector in those temperatures with little or no wind.
I don't have a DCS system available nor the aircraft weights etc. to work the details out but know from experience that the aircraft performance would require reduced MTOW.
Decision between offloading bags and making fuel stop comes down to whether or not the carrier had an option to get the bags to DUB in reasonable time against the cost of a fuel stop (landing, handling, time etc.)
GH