Radial Sweep and its morphs have a very serious bug, if the targets around you are on ground that is only just a little higher or lower than where you're standing, it will always and completely miss.
For example if you're standing on a staircase, you will completely miss all targets above and below you on the staircase. If you're standing on a slight slope in the grass, you will miss all targets that are around you on slightly lower or higher ground.
For Radial Sweep to hit, the target has to stand on the exact same altitude as you, and I really hope this gets fixed soon.