300 hours per season? Wow. You probably don't even need bottom paint for anti-fouling purposes. She doesn't sit still long enough for any marine growth to get a strong hold.
On my boat that gets run a pitiful 50-60 hours per season, I use and have used successfully for many years- Trinidad. It seems to hold up well, inhibits growth, and still looks good at the waterline after a year. I do haul and paint every season, and I boat on the Chesapeake. Here, the water gets quite warm in summer and slime and grass grow quickly.