We have a 21.5' Fourwinns Funship and live on the broads. Some days it doesn't matter how big your boat is, if it's blowing it's rough going. But I've been on the broads in every type of conditions and never had a real problem. Sometimes it's a bit slower then others but if you get the boat up on plane properly you can get right over most of the waves. Other then the broads, pay attention to the wind direction and you can always find a calm cove / side of an island to get calmer waters. It's one of the my favorite parts of the lake...the conditions are constantly changing but you can always find a calm place to go for a swim or tow a tube or shut it off and float...
