First of all, I REALLY like the serves, but since you insist on feedback I'll have to admit that I went back and rewatched it like 3 times to find anything that is even remotely off.
It (ironically) comes down to a philosophy thing, do you want to imitate ZJK to the best of your ability, or do you want to produce the best version of the reverse pendulum serve that you can come up with?
I feel like your entire movement is quite similar to what ZJK is doing, however I think that you could generate more spin and especially disguise your serve better if you would redirect the movement towards the table, not quite as outwards to the side as in the video.
It's hard to tell based on footage, but how much backspin are you getting on the serve? How easy would it be for an opponent to flick the ball?
If you manage to get a good amount of pure sidespin, pure backspin and a mixture of both with the shown movement, then scratch everything I said above. If you struggle with the backspin, try raising your elbow a bit higher up to shoulder height, thus creating a more extreme (and more awkward) racket angle. It should in theory facilitate generating backspin.
