If you want more spin on your kick and slice serves, you're going to love this video: Ramon will reveal a step by step process for adding more and more spin to your serve.
1. Toss - There's a good chance if you're not getting the spin you want on your serve, your toss is in the wrong spot.
Make sure for the kick serve, if you're right handed, your toss is at 12 o clock, slightly into the court.
2. Contact Point - for the kick serve you need to be making contact at 12 o clock, slightly into the court, at not quite full extension, so the racket head can accelerate up the ball, and impart the spin.
3. Elite Throwing Mechanics - You must be able to generate easy racket head speed to get easy spin on your serve.
This is achieved primarily through having elite throwing mechanics.
4. Racket path - Finally, the racket path must be correct.
Out and up for the kick serve.
Up and around for the slice.