Had my Sprint for nearly 3 months now and in the early days I to found that I was getting terrible pains and numbness in my wrists. One trip my fingers locked and I couldn’t work the front brake any more. I tried to buy a Cruise Control system because all of the bar rising kits id seen looked ***** and expensive. (Having said that if someone knows different id love to hear about it) The one I settled on was from
www.brakeawayproducts.com .This looked to be about the best looking and most practical device I could find. Sadly I was unable to get it shipped to the UK. I then stumbled on a quick fix from Scottoiler called the Cramp Buster. And at only 6 quid I gave it ago. It works amazingly well. Iv fitted mine to the left of the grip instead if the end. This means that I can accelerate with my thumb and not twist my wrist. Or twist it to a different position and I can sit up and accelerate with just the tips of my fingers on it. It fantastic.
I also found in time its not nearly as bad as it use to be. I think iv adapted and now sit / ride in a different stance to when I first bought the bike. My Speed Triple has straight bars and I think that was the biggest probable. I still get the odd twinge once in awhile, especially at low speed but then I just start using the “cramp buster” again
I don’t think is possible to lower the seat. You might find a thinner one but wouldn’t it burn your arse??