When negotiating a turn, pick your focal point and set your lean angle and speed, and maintain that through the corner. If you find the turn decreasing/increasing in radius, you'll have to adjust. If you maintain your lean and speed the bike will carry through the curve. Give this a try. If you slow in a corner, you'll see the bike lean over more, and thus your turn will sharpen. If you roll onto the throttle, the bike will want to stand up, and cause you to turn wider.