So I just talked to a CaseIH combine specialist a couple days ago and he specifically told me that those heads were not ready when they were launched, but the deal with MD was up and they had to launch or go without. That said he told me that there are numbers updates for those heads, including the center knife drive which he said was an issue on the 62, not so much the 52, that are I believe he called them PIP? which basically means Case will update the head at no charge to you. Only thing he said is sometimes availability is not great.
So I would have your dealer check it out, there is probably a few updates out there for you.