I use eneloops in the grip and shoot in AF-C. I don't shoot sport in RAW. I need to look at my settings for noise reduction and ISO. I don't use 51 points.
I couldn't see the fps from exif data (or rather not sure how to calculate it). Sometimes the camera is like a machine gun going off, but sometimes it seriously stutters (and I thought I've focused properly on most of these occasions).
For cricket I am using the Sigma 150-500 which struggles a little at the outer end when it gets cloudy. Maybe this is all about the focus hunting even if I think I'm locked on?.
Anyway, it's very interesting to see all the things that could influence it.