Rowan makes a good point about the seat height. It's hard to tell from a picture, but I think the seat may still be too high. This instability may be leading to putting too much weight on your hands. Your position looks much too upright for a person of your age. You aren't going to be able to develop as much power as you're capable of. I don't know what your goals are, but you posted this in the long distance forum, which is a performance-oriented forum to some degree. What I see is a position that is appropriate for bopping around the park or riding 60 miles and calling it a day. You might be making up for it with muscle at this point. My recommendation would be to go down on the saddle and get a 7 degree 100mm stem w/ no spacers. People think that having an upright position has no costs, but it does. It's only a good idea if that's the only way you can ride.