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@gbj_tester
This, by the way, shows that SRAM marketing is winning over education. There is no meaningful difference in stiffness between different kinds of aluminium alloy, and you don't know which alloy Campag are using anyway. I've just looked up data sheets for typical Dural and Zicral class alloys, and the Dural was actually rated slightly stiffer (Young's modulus) at 73.1GPa for 2014 vs. 71.7GPa for 7075
Alcoa don't even think stiffness is worth mentioning in their marketing of 7050 http://www.alcoa.com/global/en/products/product.asp?prod_id=606, the main selling points being better resistance to stress corrosion cracking and better suitability for thick sections compared with typical 7075, neither of which seems especially relevant to a fairly thin track crank.