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When I did midfoot I actually had to put my saddle back rather than forward, and a long way down. While it's not very intuitive, apparently that is not uncommon.
If I'd just shunted my saddle forward, by the same distance as from ball to midfoot, to keep my legs moving in the same pattern as before, I 'd have been way too far forward with loads of weight on my hands.
It might depend on leg length and how much set back there is to begin with.
If you go midfoot then it's highly unlikely you are doing KOPS!