get higher bars
I had this very same problem last month. I am converting a Diamondback mountain bike to a touring bike. The problem is that on prolonged riding there would be pain and numbness in my wrists. At first I thought of an adjustable stem, but I asked several people on this site and they said that if you plan to go off-road then the stem will feel "soft" and "non-responsive". Another solution was a stem riser. However I do not like how they look on a bike. It almost looks like you have two stems on the handlebars. Another problem is that you may have to change your cables if you go this route. My solution was to get a butterfly handlebars. They had greater rise and brought me closer to the steering. Aslo I now have many more hand positions. It also made my saddle more comfortable since I sit more upright.
Hope this has been helpful. Look in this forum under "Adjustable stem?" to see people's answers to me.
John