This is my closest imitation of ZJK serves, when I was once obsessed with learning such. I really like the ones after 0:31, where my brush is much better.
These are my other Reverse side spin variations and I have some similar serves here as well
But, I have to confess that I never use them in games because
1) It is ****ing hard to do pure backpin ones
2) I don't want to face my own demons when the ball is loaded with opposite spin when the ball gets returned
3) I don't want to lose the point because it doesn't fit my playstyle due to inexperience.
I agree with others that one needs some real practice and understanding of match strategy to use reverse sidespins because usually, the ball reaches the right end of the table loaded with backspin and regular sidespin. This makes it hard for amateurs to loop such balls.
The other thing is this system supports backhand oriented players well like Ovtcharov who goes for third ball attack with backhand.
When it comes to third ball, Ma Long drives the ball out of Wembley Cricket Stadium and Further, I voted him for 2016 Presidential elections. I would like to side with the president