Ok, I don't really know how to ask this but. Have any of you ever had the problem with literally pulling the front end of your bike off the ground on high power/speed climbs? Sometimes it is so bad I wish the bike was about 40 pounds heavier so I had something to offer resistance besides my butt in the saddle. Or another one I have when I do high power starts or suddenly increase power out put significantly, I tend to throw myself up out of the saddle on each pedal stroke, until I find a gear big enough offer enough resistance to keep me in the saddle. You get a sore butt at a high enough cadance . Not that I'm super fast or anything just curious. Any ideas why this happens?