As far as charm bombards not hitting city units... not enough testing has been done on charm buildings to know for sure. If you playing on DEBUG mode, you will know for sure... otherwise it's tough to tell, because charmed unit will 'sink to bottom of the stack'. It seems there has been different results. I have 100% for sure seen units get charm damaged with charm barrier in place. I was testing with 99 bombard and high RoF though. Seems units in cities act different with charm bombard (obviously ). You got BombardFX to work with Charm units? Great! IIRC, those explosions I couldn't get to show up.