So one thing I see right off the bat in the first video is a lot of what looks like pure wrist translation to move across the strings. That in itself is a harder movement to both speed up, and to facilitate a double escape because by nature it’s not very fast on its own, and it tends to have a very straight linear path across the strings.
Now most people don’t physically actually use just pure wrist translation, because it’s pretty hard for most peoples wrists to move purely side to side that way, and indeed you have a slight bit of rotation in there, but maybe just not enough. I think a bit more rotation added in, in order to facilitate both added speed, and that shallow “u” shaped pick stroke needed for a double escape might be the ticket.
If you take a look at the other recent video posted by another user on this very topic, you can see that slight gyrating rotation that is employed to pull it off.