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Off the wind main only is fine in most cases, although the helm can get heavy in a closer reaching situation. Beating effectively is where the main-only situation is going to be less efficient.
Your boat should do fine genoa only too.. with the B&R fully backstayed rig I don't expect you'd have any issues unless you were really slamming hard into a large head sea.
The point is, really, the boat will sail with most any combination in most conditions... it's just a matter of comfort, balance and speed. It can be fatiguing to fight heavy weather helm for a lengthy passage - often a balanced plan of reefed main and appropriate headsail will just feel better, and go better too.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)