Consider the weight
While a sail from a smaller boat might give you OK sail area for what you need, they typically would also have a lighter weight of sailcloth, as the smaller boat would be using the sail in lighter winds than you're considering. Using a C25 110 might give you OK sail area, but I'd bet the sailcloth would be a little light for what you'd want in 20+ knots on SF or San Pablo bays.Call a sailmaker and ask what he'd recommend for size of the sail (Sq ft and hoist/foot measurements), as well as cloth weight.In the Delta, we all use club footed jibs, which are a little smaller on the foot with the same hoist so that they pass in front of the mast without any overlap for short tacking up and down the river. So they are a little smaller in sail area than a typical 110. But they have a good weight of cloth. I've used my club jib w/o the boom in 25-30 knots on SF Bay and the ocean, with 2 reefs in the main and it's great.