The use of the cc-pV(n+d)Z/JKFit sets alongside cc-pVnZ-F12 orbital sets was explored to determine the magnitude of errors that may result from the DF-HF component of an F12 calculation. To ensure high-accuracy, we recommend that cc-pVnZ-F12 orbital sets are paired with cc-pV([n+1]+d)Z/JKFit, which results in DF errors roughly equal to those from the cc-pV([n+1]+d)Z (with matching JKFit) sets that have a similar level of BSIE at the HF level. For F12 local correlation methods on very large systems, some practitioners may desire fewer functions in the auxiliary basis and further data to inform choice of JKFit basis is provided in the SI.