Ceylon never went through a period of intense blowing coat, at least not that I ever noticed. His coat just gradually got harder and harder to deal with until about 10-12 months, then gradually got easier to deal with. He still sheds a lot for a supposedly "non-shedding" dog (I know that's not accurate for any dog - but Cey still sheds a LOT!); somebody told me when I asked about it that some Havs are like that - instead of blowing coat all at once, they do so over a much longer, more gradual period of time. Is Jinx's hair clipped? If Cey's had been clipped I never would have noticed any issues with him, even at his worst.
Also, some Havs just have naturally silkier and easier coats in general. Sounds like you might have gotten lucky on both issues with Jinx