Regarding the gesticulation, for me it's usually when i describe things to others I tend to visualize with gestures grabbing and moving objects in space or draw in the air - like to illustrate a line graph, or sine wave oscillation. The same happens for example when dismissing someone's concern (I clash a lot with people who are concerned about things and worry) by "brushing it away" with a hand gesture. These happen unconsciously and automatically but I've noticed them after watching a few candid videos of myself with socionics in mind.
I see IEI gesturing quite a lot too, but the gestures are more "detached from reality" as in they don't look like they manipulate well-defined objects, to me it looks more like random hand waving because it's probably related to some more abstract imagery.
The "stuttering" T creative thing I had noticed before in SLE and ILE, but it's Gulenko who wrote a pretty good description about it (it's on a webpage somewhere too but I quickly found this post on the forum https://www.the16types.info/vbulleti...ion-by-Gulenko)