Definitely some weight to be saved in your wheels if you're willing to drop some serious money. Extralite HyperDisc MMX2 comes in sub 1095g, and you could go even lighter if you were willing to go with tubs.
Schwalbe Thunder Burt as a rear tire would shave some weight and you would keep the Rocket Ron up front for grip.
As has been stated, Schmolke seatpost, DT fork, Clavicula crank arms and a KCNC cassette are probably your biggest places to cut weight.
Look into a full carbon saddle. Plenty of them around in a similar shape as the SLR.
Extralite stem would save around ~50g, and a New Ultimate Evo bar would save a tiny amount, but also increase the ride quality because of it's width.
Other than those things, you'll have to resort to tuning parts (alu.&ti bolts, new pulleys, dremel tool, etc.). 500g is a lot of weight to save on an already light ti
bike. If you really just have to have a bike that light, I'd look into a new frame.