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Do you have some samples with EXIF data? It's hard to diagnose anything based on your description.
Also, phase detect AF by nature will not be 100% the same every time you focus, but it should be very close. I second the recommendation to only use AF-C, as it will correct for minute movements both on your part and the subject's part if applicable, which could be enough to throw the image out of focus at wide apertures.
If you're really worried, set up some controlled tests using a tripod and a remote. Compare PDAF results to CDAF (live view) at a medium distance (10 ft or so) as a quick way to check AF consistency.
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