noisey valvetrain

I have an Xtreme Energy solid cam with aluminum heads and it is noisy!! I read an article somewhere just recently about the valve train noise related to these cams. The article mentioned something about the design of the cam creating a faster velocity of the valve as it closes. I don`t know if there`s any creedence to lend to the story but I`m learning to live with the noise. Some say aluminum valve covers will help quiet down the valve train. Like you, I`ve tried adjusting the noise out to no avail.