I am still experimenting with the hand positioning. I do have that problem and its not going away. I admit I did not go to the fitter to make adjustments.

For me, this is how I see it, at least for now.

On a typical road bike bar, there might be maybe 4 positions to take. 1. on the hoods; 2. on the drops; 3. in-between under the hoods; 4. on the horizontal part of the handlebar.

For me, all 4 positions get my arms and hands to go in a perpendicular somewhat 90 degreee angle. So I decided to experiment by decreasing that 90 degree angle. I could do that on the hoods and on the in-between positions. But it was awkward to keep arms and wrists "straight" without any kind of angle bend. I could do that for a short while and presto, no numbness.

I would like to change the handlebar so that the holding position on the black hoods, to be bent slightly inwards, thus reducing the arm/wrist angle.