Your digital noise is barely noticeable. And a lot of times viewers expect to see that a bit at high school sports.
I've been lucky enough to shoot a lot of volleyball, some with strobes and some with available light with fast glass and top-of-the-line camera bodies. Even with the crazy-fast motor drive, I still miss "peak" moment sometimes. It's helpful in the long run to use single shot instead of the motor drive. Train yourself to get the peak moment.
Nice stuff and keep shooting.
