I know what you mean by the way they feel "soft". Coming off of 2 stroke racers, the brakes on the 650l feel like they don't work. Even after bleeding mine out they were better, but not even close to as responsive as the ones on my CR's. I would think though without alot of headache, a person could mount the braking system of a CR or CRF to a 650L. Might even see if a shop might beable to turn the rotor or rough it up a little. Make sure that the rotor isn't worn to much through the center, that will have alot of effect on the performance also.
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Twenty years from now you will be more disappointed by the things you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." ~Mark Twain
2007 XR650L