Modelling Sampras serves

The other day I was studying Sampras serves again and I was certain that I would be capable of copying a few aspects of his technique.
During the last year I have been really keen to mimic Sampras great serve, but no matter how much I tried I always found the shoulder turn to be to extreme for me. So I dropped and followed a more "Federer" action with a few good results. But a few weeks ago I was on court and all of a sudden I found a way to turn my shoulders with my back to the net with no strain just by tilting my head back away from the net as soon as I tossed the ball. And one day magic happened I delivered a few serves maybe 5 or 6 with a greater speed and I felt I was getting more spin as well. But it come as fast as it went. One day after with the camera rolling I wasn't able to do it. Was it camera pressure? Probably, and I felt I was rushing the whole process and didn't let the magic happen. However her they are my two serves that look a bit towards Sampras style:





What to do now? well here is the list:

Open the stance a bit more.
Change the grip to more towards continental.
Toss with the palm of the hand towards the sky.
Toss much more towards the net (forward arc).
Bringing the racket up for the trophy position without aid of the wrist.
Have the left hip more towards the net for the trophy position.
Have the right elbow bend just after contact.

It will probably take me at least 6 months to incorporate some or maybe all of these changes into my serve. I'll try to enjoy it every bit and I'll keep you updated...