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You already have one of the fastest wheels out there, and leg trips give a proven CdA reduction.
Getting lower isn't necessarily faster, look at TarmacExpert and Tops' positions on the bike. They don't look anything like someone like Bottrill, but they are very slippery.
Aerocoach gives you real-time analysis and Xavier is your aerodude. Much better to spend your money on that than a new disc wheel.
weren't leg trips the new holy grail (cheap, light, faster)..?