If by the Upper South, you mean Virginia, that was Anglican country. No Cromwellian Roundheads there, strictly Cavalier Country .... at least in their minds.
I'll beg to differ, beiing descended from a few. Planter society and the Anglican establishment went hand in hand, but ended with the Shenandoah Valley, which was an American version of "beyond the Pale." There you'd find not just Scotch-Irish Presbyterians, but Baptists, Quakers and others.
They were there specifically in order to be beyond the reach of Anglican State religious authority.