bumpski - 7:44 pm on May 8, 2012 (gmt 0)
All I can contribute is; "smart pricing" has supposedly always been an Adsense account wide impact, for all your sites.
Ridiculous, I know but, that's the way it's been. I will say, if you have a spouse and you both have websites, but are sharing one account for Adsense, the Adsense team has advised me personally that you, and your spouse, may each have your own Adsense account. HOWEVER, even then, say 2007, they suggested signing up using two different PC's which I interpreted as two different IP addresses.
If this was done it might reduce "smart pricing" interaction for the two websites.