Dreamflight767 wrote on Oct 23^rd, 2020 at 4:47am:

I attempted to use TOPCAT to calculate TO.  The values given were almost identical to the default numbers calculated by the FMS.  When I commenced TO using values for TO-1 52C derated, I would have gone off the end of RWY had I not advanced to TOGO.

Also, with your margin of 593 feet, at my company that would not be enough of a margin. That short distance could be gobbled up almost from doing a rolling takeoff and non-SOP takeoff procedures. In TOPCAT I look for at min of 1000ft and by then I should probably be at a higher flap setting.