I'm not worried, my faction is still on lvl 7 with a herculean task of getting enough propaganda to complete the level. We do hundreds of attacks and yet rarely get propaganda. Although I did get 6 once on an attack. The frequency of propaganda drops seems to be very, very, very low, not what has been reported it to be. It's nice to get multiple cans of prop but they are so few and far in between that it's crazy to think how factions will ever get enough to move on.