Like everybody else has stated, drop your seat and maybe move it back some...not so much as to stress the rails, but enough to change the cockpit.
Definitely change the stem. Other than actual top tube length, the stem and the seat position/height can affect your riding the most.
Just as an afterthought, check/maintain your air pressures or spring pressures in the front and rear...a weak front end will want to pitch you over (I know this from experience)...too much/quick rebound in the rear will tend to bounce you around/over/up...