65 works out to the max axle rating pre-2008. At 4550 on the pre-2008 axle with its 4600-lb rating, 65 is right. One of the few where it IS right, actually, since many, if not most, C's don't have that much front axle weight. Ours is another one that does, and again YES, the 80 a tire shop put in a new pair of front tires made it "nightmarish" (great word choice there Ken!).
We've had OP's with 3000 on the front and found they're running 65 or even more. That's as bad for handling as 80 where max is 65. Probably worse since Ford expects front to be loaded at least 32% of total loaded weight.