Daily sessions: 4000 - 7000 Geo: Croatia, Serbia, Bosnia- combined around 85% I'm currently with revenuehits.com, and earning around 60$ per month. Looking for another popunder network with similar or better performances.
I think you should test few networks and then you'll be able to choose the best for you. You can try following options: popads.net popcash.net edomz.com plugrush.com (adult)
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Propellerads, popads, popcash - give them a try But not sure how they will be good for Balkan traffic...
With those Geo: Croatia, Serbia, Bosnia good rates is difficult .BUT you can try TrafficHemy Ads Media ,Check official Threats of TrafficHemy in DP
I also had some inventory from Balkan region. I am currently working with popcash and they managed to offer me a rate slightly bellow $1 for similar countries. I had to switch on tier 1 countries for more profit, however you can give them a try.