I may be pushing the envelope of this thread, but how about small racesails for this type of sailing? I find that my 4.8 and 4.2 freemovesails almost never seem to cover the required "gustrange" at these windspeeds - it's too much "stop and go/overpowered". I would expect a small (<= 5m) racesail to have the largest usable windrange in one trim.
But would this be compatible with e.g. a PA74?