The micro denomination really fall into three categories. Some, like the Free Presbyterian Church, the Free Church of Scotland, and the Free Reformed Church are related to denominations in Scotland or the Netherlands. Others are the result of schisms like the Heritage Netherlands Reformed Congregations. [You did not list the other Netherlands Reformed Congregations denomination from which they parted company. I doubt that they are larger then the Heritage group.] Still others are startups, usually independant Churches coming togather to form new Presbyteries.

Not mentioned were the several Bible Presbyterian Church denominations.

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Thomas Yeutter,
Mason, MI
Member St. Patrick's Anglican Church, Comstock, MI

Ezra 7:10 For Ezra had set his heart to study the law of the Lord and to do it and to teach its statues in Isreal.