I switched my mtb to a jones h loop bar and am very happy. I have also found though that I can still get numb hands; my best strategy is to ride harder. There are three points of contact with the bike: the pedals, the seat, and the handlebars. Unless you are doing some Sweet Jumps, 100% of your bodyweight is distributed between those three. When you are coasting/seated, most of the weight is split between seat and bars. The more weight on the pedals, the less on the seat and bars.

Also, I was heading towards carpal tunnel, I was lucky to see a doctor at about the same time for a pinched nerve, he explained to me I should not sleep with my wrist flexed, but in a neutral position. Since then my wrists have been better.