And that is exactly the same problem. I had the same problem with an LF lens that the repairman fixed and the pointed out needed the same exercise that the Hasselblad lenses did.
I don't think there's enough similarity between the FTn's shutter and a rim set leaf shutter to make that assumption, no. It's not just stiff when you get there, there's something in the way. I've seen what you're talking about on Wollensak Graphex shutters on Speed Graphics and also whatever the shutters are on Yashicamats (especially bad due to the reducing gear between the tiny knob and the big internal selector ring). This doesn't seem anything like that.
And all the slow speeds fire in excellent time, which suggests that the camera was well-used. It shows no signs of prolonged ill-treatment or neglect, just some one-time incidental damage--frame counter is sprung too, and it has a dent on the pentaprism housing.
The question is, do you spend the money to fix the problem?
At this time, no, but I wanted to know if this was common. I thought there might be a fix involving minor disassembly that I was competent to do. But at this point no one seems to have had direct experience with this. I like the theory that the gearing may be a little out of position advanced by
@Kino et all, but that doesn't explain how the slow speeds fire correctly when selected normally--i.e., with the number centered in the viewfinder and on the ring.