I too have had numbness issues in my hands, even on short rides. Mostly due to wrist surgery in 2015. I had tried all kinds of grips on both my HT 29er and Egons GX MTB series on Jones Loop bars without success. I had pretty much resigned myself to Rich's suggestions above, shake out my hands, etc. I was recently turned on to
REV Grips and borrowed a pair. Whoa. I did 3 test rides here in rocky AZ including a 7+ hour decent off Mt. Lemmon & the Catalina SP trails without any issues - no tingling sensations, no numbness, etc. I was pleased enough and bought a pair. I've only done one ride on my new set, I went with the largest diameter 34mm (demo'd the 31mm) since I tend to like larger grips. The initial cost is a bit steep for grips, but you can replace individual parts at a reasonable price as they wear out.
This isn't quite my final setup, but close. I'll add Togs & all the K-Lite powering magic. There's a small strip of velcro under the bottom center of the map case to prevent flopping, yet easy access to the center bag.
My TD rig. A Binary Bicycles Havok Ti 29er. I'll be putting 2.0's on it, currently setup with 3.0's - left over from the Tally Tango 160.