Since watching the sonic serve video, I concentrate on getting a good hip stretch and maintainting it. I stopped worrying about my final stance to prevent it from interfering. If I end up dragging the back foot forward, so be it. Maybe I will focus more on keeping a platform when I am more of an expert at the hip stretch, but for now, not worrying about it is working well because it is enabling me to accomplish the more important aspects of the serve.
I was previously sold on the platform stance, but now I'm not so sure if platform vs pinpoint makes much of a difference. That's another reason why I'm just kinda letting it happen.
Vin