Aluminum cogs? The big ones especially.
Have you optimized your pedals? Ti axle, esp for the short event. I think the Look hardware is steel, just soft. There are ti bolts out there for Looks. Alum spacers if they're not already, I don't know what they are. If it were me I'd make my Aerolites work. About 70g per pair with cleats and hardware (they say 38g per side, that's about right), but it's the devil to set up, you have to drill into your shoes. In fact I still want to make my Aerolites work but it's such a pain.
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"...during the Lance years, being fit became the No. 1 thing. Totally the only thing. It’s a big part of what we do, but fitness is not the only thing. There’s skills, there’s tactics … there’s all kinds of stuff..." Tim Johnson