If you're talking to me, I know full well that there is no such thing as a true topspin serve. It's all sidespin. And the most upward rotation anyone has ever put on the ball was Pete Sampras spinning the ball at 8 to 2. That's not even 45 degrees! That's just 30 degrees, and he's a pro, the best server of all time, and generates the most upward topspin angle, yet it's ONLY 30 degrees!
However, ATTEMPTING to hit 6 to 12 will impart the idea of TRYING to brush up on the ball and will send the ball higher over the net. If aiming for 6 to 12 leads to 8 to 2, what do you think 8 to 2 will lead to?
And Roy, continental is fine for EVERY serve in the book. Also, yes 6 to 12. It doesn't matter if you have a kick serve if you can't get it over the net. What's the point of having a good shot if you can't get it in? Kick serves should have 3 feet of clearance over the net (give or take). You learn to walk before you learn to run. You learn to run before you sprint. You learn to hit slice serves before topspin serves, and topspin serves before full on twisting kick serves.
The method he is using to hit a kick serve is probably the fastest and easiest way to hit a kick serve. It works! I've tried it. It's much easier than spending months perfecting the idea of brushing up the ball. However, I already developed a kick serve when I tried it, so it came to me a lot easier.
Also, EVERY serve is hit with sidespin and nothing else. Kick serves are sidespin serves hit with a higher spinning angle. Like we already said, the steepest topspin serve ever generated was spinning at 8 to 2. That's a LOT of sidespin.
Not trying to be rude to anyone or anything, I'm just trying to emphasize a few points.