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Hey Masoko - In the past, I've had luck with 410ing the previous site and putting a link from it saying that we've moved. This way, you keep any direct traffic by referring them, but you also don't redirect your pages via 301. Penalties pass through redirects. You don't want to keep both sites and duplicate content. I'd kill off the old site (it's only 6 pages, so that's pretty easy) and take the chance to, as has been said, refresh the content. Also, think about adding more pages to the site so you can rank for more longtail terms. Good luck.

Thank you Gentlemen!!!

Also, the weekend patterns get further amplified if you turn ppc off for the weekend.