Just wondering if you had a chance to measure the JPX 919 series?
JPX 919 Tour is 433 MPF, putting it in the Conventional category.
JPX 919 Forged is 619 MPF, puting it in the Game Improvement category.
JPX 919 Hot Metal is 754 MPF, putting it in the Super Game Improvement category.
I do no thave the JPX 919 Hot Metal Pro iron yet, but it is on the way, so I should have it soon.