It's pretty simple, really.
People mainly do Conquest for those aeromagnifiers, and their guild isn't good enough to do CPit. They love their guild, but they also want to grind for Executor and they want to grind for JMK to help with CPit.
Given that the difficulty behind Conquest is just that much tougher, it would only make sense to extend the R8 materials so that T4 chest gets 5 aeromagnifiers. T5 chest gets 10 aeromagnifiers. T6 chest gets 15 aeromagnifiers. T7 chest gets 20 aeromagnifiers. I'm very certain this will change a lot of people's opinion of Conquest and help make the game mode more enjoyable.
Even nerf the other aspect of the rewards and try to keep to the R8 materials. It's about the R8 materials that's triggering everyone, so this would probably be a great change on top of all those patches for the bugs you are experiencing.