2 new serves in my mind

I've been trying out the wiper serve unsuccessfully for a long time( I've been trying to copy this serve, look at the black shirt guy's serve). It's actually just a forehand tomahawk serve/reverse tomahawk, but apparently a lot of people are having big trouble with it. Problems: I can't serve short, it has negligible spin differences on it, because i find the motion so awkward. I recently thought of using the back rubber to do this serve. I tried the motion already and I think it's way easier to control. In addition, the starting movement can be the same as my well developed forehand tomahawk. Might be good to try out.

Also I have another serve in mind, which can combine the pendulum AND the reverse pendulum serve, rather effectively. It looks like a using a dagger to stab. With the bat pointing forward, do a reverse pendulum with the bat contacting the right side of the ball. Then rotate your hand swiftly clockwise while your wrist moves the other direction(this is to disguise WHERE the wrist changes direction). It ends with the bat contacting the left side of the ball. The spin difference goes like this... top-side(reverse pendulum variety) -> pure downspin -> top-side(pendulum variety).

Serves improved over last last week. He Zhi Wen's serve, own developed reverse pendulum. (I can control their placement and spin very well now). I think I'm going to keep an excel file on my serves, on the types of spin, ability to serve short, ability to serve fast and long, ability to vary spin, amount of spin and the reliability.