What a Rush isn't great, but it doesn't need to get bumped up to less than 30% physical armor for +1 AP. Even like, less than 50% health for +1 AP would make it much more usable. It's not like every single time you have no armor you get instantly CC'd. Plus you could potentially have less than 50% health but still have armor with fortify and magic shell and shield recovery.
Ultimately there needs to be a fundamental change to base health and the CC system to make it a little less worthless once armor is gone though, instead of balancing around health being not very useful.
