Thanks ladies. I think I may not realize that I am pulling up on the front end of my bike. It never happens out of the saddle, infact the opposite happens. I've unweighted the back of the bike enough to cause the rear wheel to skip and lose traction. The first time it ever happened I just about fell over the handle bars.

What about the high power starts? I'm I starting in to low of a gear so my cadance goes out of control throwing me around?

Oh, Roadraven! Usually to me it feels like the bike is to small when I am trying to stretchout on the top tube to get more aero. My rear usually ends up being an inch or two off the back of the seat. I think 4 to 6cm in metric. And there are times that it feels a little big such as crank length and seat tube.