A trick - sorry, I mean procedure - we used on the B732 was 'improved climb'. If excess runway length was available we would calculate a higher VR and V2 to get a better L/D to improve 2nd segment engine-out gradient. I can't remember how we calculated the V-speeds and extra RTOW from the T/O perf manual data. A graph maybe?
Another dodge - sorry, procedure - to achieve higher RTOW was to visually avoid obstacles penetrating the nominal engine-out climb-out path if the weather was suitable. IIRC Naples R24 was an example.
So, did IC arrive at the same time as Perf A?