my mechanics mostly come from baseball, so I'm a roll hitter. I'll hit around 20 HRs in a season, spread across about 60 games. Mostly, I try to hit gappers and oppo on the right pitch.
www.swingmechanics.com is a great resource for swing tips, and he has 2 DVDs that many people swear by. the guy who owns the site is a baller from Georgia, who is not much bigger than you 724 and hits the ball a ton. but he's got a ton of tips and tricks right on his website. that's where i got my grip from (pinky drop). and with anything you try differently, the only way to perfect it is BP. lots of BP.