Just a thought before you start changing stems. Reach should not be adjusted by moving your saddle fore and aft. First set your saddle height so that you have a 25-30 degree bend in the knee at the bottom of your pedal stroke. Next, adjust the fore and aft position of your saddle by dropping a plumb line from just below your kneecap to the center of the pedal spindle when the crankarm is at the 3:00 position. Now you are ready to adjust your stem length. It is just a guess but from the pictures, and having your saddle all the way back, you are not positioned correctly in relation to your pedals.