I have had similar problems with numbness and have spent much time and money trying to get rid of it. I have damaged hand-nerves and some arthritis in my hands (I'm 73). I've found that I need some cushioning in my gloves and bar tape. However, correct fit was the biggest single factor in achieving reasonable comfort. I can now ride 50 miles or more with only slight discomfort.

The most important factor in improving (my) riding comfort was fitment, fitting the bike to me. I recommend that you go to (Bike Fit Calculator | Find Your Bike Size | Competitive Cyclist) and take the time to measure yourself per the instructions. I (like thousands before me) found the recommendations to be accurate and useful; it is a tested and proven fitting application. After using the results from this application to adjust my bike, I've had much less trouble.

We all have problems with comfort and I trust that you, with persistence, shall overcome yours.

Joe