When I've had the room to both plant the seed pieces in a trench ~8" deep and also keep hilling 18", the result was a lot of digging when it was time to harvest, but not any more potatoes than when my hills are 10".
It may depend on variety, as noted in post #8, but for all the varieties I've tried, the main thing seems to be to hill enough to keep the growing tubers from being exposed to the sun. Some varieties seem to form tubers higher than others.
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