sadly I don't have my airport analysis data at home...it is carried aboard our planes and there is a calculation made by our engineeering department and approved for each runway at our normal airports.
I don't know how your airline does it...mine is a big airline, very big airline that begins with a vowell, that is all I will say.
there is even a formula for penalites using slope for both landing and takeoff for non routinely used airports.
again I don't have it in front of me.
and again, if you aren't down in the first third of a runway, go around...that goes back to private pilot days ( of course there are exceptions...15,000 feet of runway, I suppose most planes could overfly the first half and still be ok, but let's keep it real)