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@EdwardZ
More set-back is not a solution in lieu of a longer stem. The more you push the saddle back the more you rotate yourself counter-clockwise around the bottom bracket, effectively lowering your stem.
Why do people advocate KOPS? For the simple reason that foot length is highly correlated with the length of the antebrachium (lower arm). They should, in general, be nearly identical in length. The foot is rarely longer--- and when shorter its generally as a result of wearing ill-fitting shoework during growth.
Height and foot length too is also more or less linked. The variations are more less in leg segment length, resp. torso, neck. head and brachium (upper arm) length. That is why one can more or less suggest a stem length on the basis of frame size.