My flight bag got underwater in hurricane Wilma so I have no access to any charts since I retired. Our 02 landing data was very conservative and had to have the 1% downslope included. The lowest number for runway length charts was exactly what 02 was from the displaced threshold. We couldn't throw in 5 knots for the children because then you could not land some days. My earlier post about the 25,000 pound advantage shows slope made a difference. 700 ft additional runway on 20 would not get you that much additional weight alone. We flew a safe approach into TGU using these charts and never had a problem. If Taca can justify landing under these conditions then TGU was unsafe. If they can't TGU was safe only if you followed company procedures.