So, shield regeneration speed is something that can be changed, right? As shown by one of the Seraphinx's auras? How about we stick a shield regeneration speed penalty of low/med/high on each piece of Chaos?

I think this could make Chaos less powerful without abruptly excluding some feature of it that someone might be relying on. In PvE, at least. I don't really know what could be done about Lockdown... Maybe limiting dash/cloak/shield there too, but there isn't much evidence that that would be possible...