Thanks again. I'll definitely take a closer look at the headset and break down the weight into individual components and see what can be done.
I've now fitted lighter bar tape, cage bolts, and brake cables and replaced the heavy rear cage with a matching carbon Vico and I'm back to sub 16 lbs, which is were I was when I ran SRAM Rival and DA C24s on this frame.
Of the new stuff, I am impressed with the Clarks Zero G brake cables as the alloy outers are genuinely 50% lighter than standard outers and the cost is very reasonable. Wiggle didn't have black in stock so i went for red, but it looks a bit naff to be honest.
I knew the Deda tape wouldn't be 29g but 50g is still pretty light and it's inexpensive enough but way too short to do a figure of 8 around the hoods.
Now for the 7kg barrier ...
I've been humming and hawing about a new set of wheels, and the more I read about aero vs weight then it seems I will be faster in almost every realistic scenario with my 1.75kg 50mm carbon wheels than any kind of super light climbing wheel. Maybe I can sell these wheels and buy a lighter set of 50mm, but in the meantime I can get a respectable weight saving with the 1456 g Cero AR24s for only £190, so I've jumped on these now that they are back in stock. These will do as an occasional/spare set and give me something different to experience. I should have the wheels tomorrow, and I'll get some lighter skewers to go with them. This will drop me down below 7 kg and then sub 15 lbs should be within reach!
Click image for latest spreadsheet
I'll need a new a cassette to make swapping wheels a bit easier and I'm finding the draw of the £200 Red hard to resist. Would I lose out on much by going for a cheaper DA cassette bearing in mind I'm running eTap? My pedals are still in great nick so maybe a Ti spindle transplant would be a better option, but then I'd worry about them snapping ... ouch!