I'm just going to submit it and let you guys know what they say.
If you are referring to the grilled item, I concur. Have the PF discriminate between H or I if there is enough for an I-grill. They won't certify a partial I-grill, but given the overall condition this will be a bargain basement project for them at minimum cost.
As for the initial inquiry stamp, those protruding fibers point to a simple #182, but it's your money and your education. John-Barwis (of the USPCS) published research in 2013 (in the Proceedings of the First International Symposium on Analytical Methods in Philately
) in which he demonstrated that the essential differences between so-called hard paper, intermediate paper, and soft paper were due to three different types of sizing agent used in the manufacture of these papers. The three papers are therefore quite distinct inasmuch as they have different chemistries, and these differences are readily observable once understood. Save your money on getting a cert for this one and give it some time.