Fri Mar 16, 2012 7:58 am by lax
You have swapping disabled per-Region, and that's all good, but because you have Instant Swapping checked and a Reset Region configured (because the Window Layout started out as having swapping enabled from the wizard), both of your instances will "Reset" to Region 1, and be assigned to the GPU handling Region 1. (And then instantly moved into their assigned Home Regions.)
Uncheck the Instant window swapping box in your Window Layout and it should assign one to the other GPU. The same effect would be had from using the Window Layout Wizard, and selecting the full screen per character with Swapping disabled.