Hi. I can usually beat my friends going up the canyon, but can't seem to keep pace with them going down. I've been working on my aerodynamic positioning, but I think it could be my stock Specialized Hubs laced to CXP22s (on my 2009 Specialized Tarmac) versus my friends sub 1500g wheels. Do you think I should upgrade my wheels?

Also, how much should I worry about weight versus a reputable name/ quality hub?

Thanks,
Max