Rob
Words of advice for riding a sportsbike in the racing crouch.
You should not be putting much weight on the handlebars / your wrists - as you have found out - it hurts.
You need to use the muscles in your back to support you ; not the handlebars.
Did you also have a painful neck / shoulders too ?
This is because of you are not using your back muscles correctly.
You should still be able to steer with the lightest hold and grip on the handlebars - Try it!
It will also help you relax if you shrug your shoulders and ensure you ride with bent arms too.
Also remember that you are free to change your riding position on any bike i.e. Just because your riding a sportsbike you don't have to stay in the prone position all the time (change your position to give your body a break)
Trust me - all of the above works and will free your ride up considerably.
It will also help you to relax on the bike which makes your riding flow much better as you will be smoother.