Malabo
Just had a quick look at that report, they have a very heavy bird to start with at 4870kgs. Add in 1110 kgs of gas brings it to 5980kgs and five bodies at 90kgs (let's be realistic) each and you've got 6430kgs and that's without bags.
We operate a VIP configuration which we thought was heavy but it's "only" 4620kgs by comparison. That's a difference of 250kgs or more than 500lbs.