It seems that I have spent a great deal of my older adult life trying to find the elusive perfect bike and or riding position. I have bought different handlebars, grips, bar risers, foot pegs, floor boards, seats, windshields……you name it. In the end, some bikes are just better suited than others for spending extended time in the saddle, unless you are like some of the more hardcore mile munchers on this forum who can do all day / multi day trips on these old beasties.
But more to your specific problem of numb hands. When I first got back into riding after my kids grew up, I had the same problem. A lot can be done to help by being aware of your body position and making some changes. I still have a tendency to forget and I slide into a position where my arms are straight with elbows locked and my shoulders hunched up around my neck, and my back slumped forward. This kills my back in short order.
Try to relax your shoulders, straighten your back, keep a slight bend in your elbows and a light relaxed grip on the handlebars. I have to constantly remind myself and make adjustments to stay like that, but it really helps.
Here’s an article you might find interesting,
https://motoress.com/ride/nine-ways...nd-hands-for-a-more-relaxing-motorcycle-ride/
I am also running a set of foam grips that I find to be extremely comfortable,
Anyways, good luck with your bike and I’ll see you around the forum!