While sailing under just the 150% genny is probably not going to stress the hull in any undue way, it really isn't the right question to be asking. The thickness of the laminate does little to help if his rigging is in bad shape.
Not to be a doomsayer, but I'd like to point out that if you haven't checked the rigging on your boat, and checked it thoroughly, running under just a large headsail can stress the backstay more than normal. If the backstay swage fittings are at all compromised, from stress or corrosion, you could be risking your rig. A mainsail will tend to help pull a mast aft, reducing the load on the backstay.
Just my $0.02 worth.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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