This is scheme is similar to what I had in mind for the early saeculum. You are using the famine cycle as an external pacemaker. Thus, these generations are not creating cyclical history all by themselves in as S&H's generations do. Instead they "color" a history that is
already cyclical.
Here is where I have a problem:
Heroes come to social maturity suffused with and supporting Nomad-founded objectivity but bring a new communitarianism to it ? and they reject the theretofore dominant individualism and doctrinal skirmishing of their Prophet and Nomad elders.
Here you have Hero youths deciding on their own to be communitarian rather than individualistic. Said another way they decide to be unselfish, interdependent boy scouts rather than self-interested, independent hipsters. Who would choose that? Have you noticed how many of the Millies here don't
like the way they are portrayed by S&H and prefer to be considered as Xers? Few people would
choose to become communitarian, the natural impulse is to look out for yourself and your family.
Similarly, few choose to be objectively orientated--if this outlook wasn't rewarded. The objective world has standards, levels of competence to be achieved. Failure is possible. The thought ways of the objective way are things like science and engineering which are generally recognized as hard. The subjective approach is easier and more appealing. How many professional artists practice engineering as a hobby, as opposed to professional engineers pursuing art?
Thus, I would argue that the default mode would be subjective, individualist. Given everything it needs and the freedom to choose, every generation will grow up to be Prophets. This actually happens during a High and so you get Prophets.
Were the High to continue you would get another generation of Prophets but the famine cycle intervenes. The Prophet parents, being inner-directed don't cope too well. Being individualist and not too good at coping they simply can't meet their children's needs--relying on God to provide what they cannot. Their kids live in the school of hard knocks--where they are forced to look out for themselves and develop an objective outlook.
They come to prize competence and raise their kids to be capable. Thus the next generation doesn't become Prophets, but instead grows up as Nomads, individualist and objective. Now the famine cycle intervenes again and you have new hard times. Being capable, the younger Nomad parents know what they need to do in order to do a good job by their children--just as their parents did for them. But they find it hard to do this on their own and are frustrated because of the hard times. Thus, in the crisis it is the parents who are thrown into the school of hard knocks, whereas in the Awakening it is the youth.
To accomplish their goal the younger Nomads are forced to cooperate, forged them into communitarian Heroes. The Heroes prize the communitarianism they learned from the school of hard knocks and instill it in their kids, just as their parents prized the objective outlook they learned from the school of hard knocks and instilled it in them.
The Heroes kids thus grow up communitarian, but fall back to the default subjectivism--becoming Artists.