Wrong.
Personally... I'd just ride it with the spec you have, Luke has put together a well thought out bike thats light but rideable. Saving a few grammes here and there won't make you a better rider, especially at your level (not to be a dick, hope you understand what I mean).
However, if you're just trying to save weight for saving weights sake then fair enough.
I'd cut every other knobble off, change to light tubes (try latex?), get ti / alu bolts, plus all the other stuff. Depends if you have money to burn or not. Those <- are pretty cheap, compared to new Karbons.