Not sure if this helps you in anyway but i have done the swap over to
Braking wave rotors 300mm and titanium mounting hardware..
There was indeed a weight loss, but more it seems from the Titanium bolts.
the rotors were like 2 oz's lighter each but new off ebay the rotors were $300, the Ti bolts were freaking $140 you do math on that one.
But here is the part that matters most to me was the increased feel with the rotors and never having any type of fade on track no matter how many laps were put in.
were the stockers had some serious coloring to them from repeated heat that will warp the rotors the new ones are like you have anymore?
With this and my desire to get the bike to transition faster as the 10R is Slow compared to my 636, even with the brakes and forged wheels, i have considered the ceramic rotors as that would free up somewhere around 3.5lbs, but not cheap by any measure.