The charges mean that dupes have to wait for it to charge and that can mean getting stuck on the wrong side of the transit system for a while. Especially at bedtime, or when the atmosphere in their location is non-breathable. I'm working with 18 total dupes and it's a big problem now, I can't imagine what it might be like with 30+.
Also boosting the access points up to 960W is excessive, even if it is only while charging. If it's a regularly used access point that's a major power draw.
As a final tier upgrade it should really just work, there's no need to limit the amount of traffic going through them.