I always had issues with my right hand going numb also. I found that I would always have to keep repositioning my hands to keep them from going numb. I ended up wrapping a whole roll of bar tape, over the existing tape, from the brifters to the stem. Once I did that, all the numbness and pain went away. YMMV on doing it though. I have heard of poeple just double wrapping the whole bars, switching bar tapes, putting inner tubes under the bar tape to take care of some hand issues. Just putting it out there for you.