Caution: 'oversheeting' a big genoa, will induce MORE forestay sag, which will cause the draft in the genoa to 'go aft' and will also tend to cause the leech to become 'hooked up to weather'. Too much sheet tension will cause a genoa/jib to become 'very mishapen'.
Better to use a 'barberhauler' which pulls in the clew perpendicular to the boat's centerline than to put 'gorilla tension' on a jib sheet and drastically change the jib/genoa's shape. But.... the higher the wind strength, the further AWAY the jib/genoa has to be from the mainsail.
Barberhauling is very effective in heavy air but I think you mean "pull the clew AWAY from the centerline" (or outboard). I think the only situation in which you'd want to barberhaul the clew in board would be in lighter air and flat water when you need to point higher.