You are indeed a bit on the heavy side for your stock suspension if you intend to use the bike as a track weapon. For everyday riding and doing the twisties, heavier springs probably won't do much to improve your riding.
This is what I would recommend................ place a zip tie around the lower tube of the right fork leg. Push that puppy up against the dust seal and take it out for a test run. Ride it as hard as you like. When you return, check the tie's position. If the tie is all the way to the bottom, you are ready for heavier springs (That is, if you have your compression damping set properly).
You probably won't bottom the forks out unless you are using the brakes agressively.
You can make your stock suspension ride pretty well with proper set up. You most likely won't get the sag set much better than about 40mm with your weight but that's okay as long as the suspension is not bottoming out.
When you take the beast to the track and learn what the brakes are used for, that's when you'll find the need for a suspension upgrade.
Keep in mind, if you go to 1.0 or 1.05 springs, you will overwhelm your stock valving. I would recommend upgrading the valving along with the springs.
Dave at GP Suspension in Portland Oregon is a real Guru at this stuff. You can easily ship your forks to Dave and have them back in ten days ready to ride. Dave is also a great source of information if you simply want advise on what and how to go about your upgrades.
gpsuspension.com
You'll find lots of information on his website along with a phone number.
