I figured it out.
The reason my wrists have been aching so much has had less to do with how I've been positioning my hands on the keyboard but how hard I was hitting the keys. Today, I've been more mindful about hitting the keys softly and my muscles aren't hurting as much. Besides helping reduce my wrist pain, it's been a good Buddhist exercise as I keep wanting to slip back into my old typing habits of slamming the keys and if I don't stay mindful, I'll be hurting again.