I've got a little experience with this. My wife had this problem quite badly a few years ago, especially on her left hand. It would actually burn a bit after riding awhile, but both would tend to go somewhat numb. In her case it turned out to be full on carpal tunnel syndrome, which has since been fixed by surgery, but that's probably a bit of an extreme situation.
I was having a little trouble last fall after buying my first ebike (not a Rad either, but I doubt we're going to be banned over it). I had always ridden a drop bar touring bike until buying the ebike, which had nearly straight mountain bike style bars. After twenty miles or so my hands were really bothering me. I did a bunch of reading here and elsewhere and it seemed that it was time for a little handlebar experimentation. In my case, I fixed the problem with an Origin 8 Pro handlebar that I read about in one of the Specialized Turbo threads here. It has a little rise to it and just enough of a sweep back at the grips that your wrist stays pretty much dead straight when holding it. I put it on over the winter and now that the weather is finally better, have ridden about 300 more miles on it and find it far more comfortable, so far at least.
I also last fall added an adjustable headstock unit (someone shoot me if my nomenclature is incorrect) that allowed me to slightly raise, and therefore also bring back a few millimeters, the handlebars. That made enough of a difference all by itself to tell me I was on the right track. After that it was just lucking into the right handlebars for me, which I did thanks to a guy named Ron in that Specialized forum here with the Origin 8 bar.
So while your mileage may vary on the specific solution, the detective work you need to do is all about the angle of your wrist and hand where it meets the handlebar, and the amount you are leaning on it when riding. You might just want to go to any bike shop and ride a few different styles that will have you sitting up marginally more or less, and changing that hand angle till you find something that just feels better.
Or you could have some smiling surgeon tell you Hey, you've got carpal tunnel and we are gonna slash the hell out of you, but you probably don't want to go that route right away. I'm sure you can fix or improve it either with different bars or a shorter or (better yet) adjustable headstock/stem.
