learnseo81 - 5:58 am on May 19, 2011 (gmt 0)
@Life Is Good
I'm almost certain that It doesn't matter If they are on same server as long as IPs are different.
Can you try to monitor the SERPs for your targetted terms and try to see If front page results are fluctuating? I also saw a thread of sunglasses website on Google Forums. You are that guy?