As someone who suffered from Carpal Tunnel many years ago, you need to look at your posture. Stand in Tadasana, in front of a mirror or have a yoga teacher assess you in this position, and make necessary adjustments. This should transfer to your sitting position.
Weak upper body muscles (arms, shoulder and chest) can greatly contribute to carpal tunnel. Strengthening these upper body muscles can prevent further CTS flare ups. The median nerve needs to remain open and not pinched, which causes the pain.
A few suggestions for you:
Garudasana arms. Make sure when you are in this pose you lift the arms in line with the shoulders.
I do a sequence in almost all my classes with namaste hands;
Sitting in sukhasana, bring hand into namaste. Keeping the hands in namaste, drop them down just a bit toward the floor. Bring them back to center. Point the fingers down toward the floor. Bring back up. Keeping both elbows in a straight line (this is very important and try doing this in front of a mirror to make sure they are straight) shift arms to the right. You will feel the stretch in this position! Back to center, then to the left. Back to center. Arms overhead, then bring them down behind you interlacing your fingers, lifting the arms and coming forward a bit. It is a great sequence and very helpful.
Dhanurasana is good as it is a wonderful chest opener.
Stand in Tadasana and interlace fingers behind back. Roll shoulders back and down. The hands will drop toward the bum. Bring shoulder blades in toward spine, lifting the chest and tilting the head up. Hold for several breaths.
You may also want to increase your intake of vitamin B6. Massage therapy is also wonderful.
Hope some of this helps!