When I flew for a particular South Asian airline and the weight for takeoff was at the max for the (wet) runway, I had a little discussion with the FO/FE and suggested to reduce V1 by a factor (but not less than Vmcg) to enable us to stop if needed. This usually resulted in an approximately 10-12 knot reduction. Unfortunately the runway analysis charts gave no guidance in this regard, and the company was not inclined either. However, if one looked very deep in the AFM their was "for reference only" data from the manufacturer. When this was pointed out to the crew, everyone thought it was a better idea than sliding off the end. The end result of course was that if there had been an engine failure, the resultant screen height would be reduced.
Not scientific, but it works.