Thatll be the next port of call. Done some maths and should drop about 450-500 grams. Still want to go below 7kg if possible. Which are the lightest cables?
Segmented ones like Powercordz, Alligator. But pricey. Conti Supersonics with latex tubes would save a bit (and make you measurably faster) but delicate.
Go fixed? Wheels are probably the biggest place to save.