I will definitely try the stem suggestion for my next ride.

The thing I didn't understand with Sheldon's page was how he described the posture. He writes that you need to hold yourself up with your muscles not your bones, and that there is a proper way to tuck your pelvis and curve your back. I guess I am having a hard time visualizing what exactly he means.

Thanks for the suggestions, I will re-read Sheldon's links and see if I understand a bit better.