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Regarding your statement:
"Other than that, it seems to have trouble tracking sports coming directly head on"
What AF settings are you using?
Obviuously Continuous, but are you using single point? 9 Pt? 21pt? 51pt? or 3D?
On AF setting a3-focus tracking with lock on - what setting? off, short nornal long?
On AF setting a1 AF-C priority setting - are you set to release? focus? or focus+release?
If you get these 3 optimized, you should get better results.
For BIF I am using 9 pt, short or none, and focus+ release. Not sure what the ideal for sports is, but I am sure someone can chime in.