after watching a friend of mine adjust to her first road bike - one of the things I noticed was how Hard she was gripping the handlebars. She was doing the same thing - swerving all over the place, having a hard time holding her line, etc. The bike is very light and very squirrly but she was also deathgripping the "bars thinking that would help her control it better. Once I convinced her "light hands/heavy butt" her handling skills started to get better. Don't know if this applies to you or not but thought I would pass the notion on.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"