Trickster's Shade Form - Does anyone know if ES recharge can "start" while ES is full?

Hi everyone!

So I finally made the leap to spec out of Hired Killer (+1 frenzy) ascendancy node into Shade Form, thinking that as I'm getting to higher levels, I'd need more defense. To me it seemed, Hired Killer was for a bit more damage, and some utility, while Shade Form would be the defensive option. (I'd already grown attached to Walk the Aether - free movement/speed, and the degen/regen ascendancy)

However, despite the loss of 1 frenzy charge, which should have put me behind about 7% more damage, I feel like I'm killing things even faster. Could this be an illusion? I'm on a computer that's too toaster to record timing tests, and when generally playing, everything is too chaotic to tell by feel. Since I leech ES pretty quickly from the degen/regen ascendancy node, usually I'm at full ES before I can observe ES recharge starting. I thought this would also prevent me from getting Shade Form's speed bonus most of the time, since I thought if one is on full ES, ES recharge can't start.

But I keep feeling faster very often, even when I leech to full before 1.67 seconds (2 seconds divided by 100% + 20% faster start of recharge). So I started wondering - could this be because even at full ES, technically ES recharge still starts (then immediatel stops because it has reached full ES)? If so, that's pretty frickin' awesome, and I really hoep GGG keeps it that way, because otherwise I would be gimping myself heavily by using ES leech. But it's not like I can skip ES leech...

tl;dr assuming no other "faster start of" stats, does Shade Form give me 20% ICS/IAS after 1.67 seconds of not taking damage, when not on full ES, no matter what?

alternative tl;dr is it possible, when on full ES, for ES recharge to "start" (and then instantly stop)?

Could anyone test this? Or maybe I should post in Mechanics Questions and wait for Mark_GGG to answer?

Judging by this thread:
https://www.pathofexile.com/forum/view-thread/1681742/page/2
I would say you are right, it does seem to start then immediately stop.

Although, judging by my experience with Occultist, it certainly doesn't work this way - if it did then ES recharge would basically never stop.

It definitely can. In fact, shortly before 2.3 came out I found a way to trigger Shade Form's bonus pretty much at will. I PM'd GGG about it, I guess they either didn't see it as a bug or didn't think it important enough to fix to date.