I get the whole swarm convert after an eb to make sure one use per person per lure eb. One problem is the psion drop rate. I did the math, and just to fully upgrade the swarm ring, you would have to do a minimum of 14 lure ebs every day until the end. That is a insane b amount considering you need 20 swarms per eb. The psion drop rate should at least double to give a fighting chance to upgrade 2 rings fully. Would be very very tough but double. Right now you'd have to choose which ring, and not sleep till the 15th