I'm assuming you're running 6 separate adzones.
Switch to ONE adzone with 6 ads to get 6 unique ads.
If you're already doing this, give me a shout at
[email protected] so I can check the targeting, but I suspect this should solve your problem.
I've been working on Formula3 (new optimization) which hasn't launched yet.
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Jay | JuicyAds Founder
Businessman of the Year [YNOT Awards 2013]

The most awarded adult advertising network with 25+ XBIZ, GFY, and YNOT Awards.