Really I'm getting the idea that the pros carry the ball 230 is based on Jack's book Golf My Way, which described that most pros (back then) carried about 230 and when they hit 300 yard drives it rolled about 70 yards. I guess they hit it longer now than they did then but still I think they're longest drives, even if they do carry 270, are because of the factors above. If you want a 350 yard drive, it will need roll, downhill, and tailwind. I'm a short hitter, and no matter how hard I swing, I can't get it past 250 without tearing something, so I really rely on wind and roll for my distance. Maybe I don't have enough distance to compete on the tour, But I certainly have enough to shoot par in about a year if I keep playing automatically.
By the way, jack said that there was a hole on a course that he couldn't carry a creek 230 out unless he hit his absolutely best shot. He said this indicates the truth about professional golf distance perfectly. Though pros are longer now with carry, they can't hit 350 without roll, elevation, downhill, and tailwind (maybe not all at once). So when you're upset because you're ball isn't going long enough, think about those factors.
Swinging hard doesn't mean the ball with go far. It's all about making the proper movements. I don't feel like I swing any harder today than I did 5 years ago, but guess what, I carry the ball 50 yards further.