In Greg Mironchuk's article he states that he only agitates at the beginning of development process and once half way through the process.The reason being that to agitate more makes the negs too contrasty.
That's what HE does based on HIS development process. Fist follow Kodak's recomendation they know more about their films than anyone else. If YOU find a need for any adjustment then base it on Kodak's agitation method.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.