[Water Warrior 2]

How hard are the grips on your bike? A softer grip or foam covers like Grip Puppies might do you a lot of good. My Vstrom has Grip Puppies over the stock grips and I have a Throttle Rocker on both left and right sides of the bars. I don't need quite the death grip on the bars and my hands feel much better after a ride. Your bike is also a V-twin so you have that typical V-twin vib to live with. Sometimes it is not bad and other times it is pain waiting to happen. It all depends on the degree of the V design and whether there is a counter balancer in the engine.
Oh yeah, something just clicked. I used to get tired hands, just plain tired. My glove were just a tad too tight and the fingers were just a smidget short. I was always working to keep a firm grip. Gave them away and started wearing my Red Wing guantlets fulltime. They are just a wee bit larger with a thinsulate lining. Riding seems to be a fulltime exercise to find comfort now and again. Keep searching for the answer.