The BE's may be getting enough power, but what about the Pi's themselves. How do you have them hooked up for power?
Both have 5V 1000mA power supplies
You need 500mA per USB.
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All the Block Erupters are on powered hubs (Rosewill 5V 5A with 5 BE's and DLINK 5V 4A with 4 BE's), so they are all getting more than enough power). I see if I can find some 5V 2A power for the Raspberries.
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Take another look at the Rosewill psu's, the RHB500 has a 4 amp psu and well run 8 sticks. The D-link is 2.5 or 3amps, some early ones are the 2.5, I have one. I have never had good luck with the D-link. I have 4 of the rhb500 to a single PI, one hub to Pi and 3 hubs the the master hub. 3 with 8 sticks and the master has 6. Two Pi's setup like this and they run for days.