I agree with your hard predestinarian views. Indeed, everything we experience has been ordained, for the glory of God and our good. Suffering and evil are included in this. And as you, yourself have alluded to before; the good news is that suffering and evil are temporary privations of good, while goodness and love are infinite.
However, I will hold fast to Creation being an act of the will of God. Creation moves from Potentiality to Actuality, whereas God is pure Act/Actuality. Therefore, creation is a result of God's act-ion, not of His nature. The eternal generation of the Son, and the spiration of the Spirit, are His inner, natural works.
However, while creation is not a result of divine nature, but divine will; it is certainly within
His nature to create, and what He creates in the BPW does indeed reflect His nature. So the act of creation is certainly not whimsical, and I do not know of any Christians who view it as whimsical...
But one thing that I think you emphasize, which many Christians loose sight of, is the fact that God created the world - and image bearers in particular - so that we might be at one with him and one another. This is a major theme in the letters of Paul, particularly Ephesians, as well as in the Gospel of John. We are many, but we are meant to be as one. This is the eschatology of history.
I do disagree with you when you say that most ecclesiastical authorities have never had an original thought, or that they are anti-philosophical. On the contrary, I find most of the theologians that I read to be quite conscious and profound thinkers. Here's a quote that I think you will find intriguing in light of some things I have heard you say before. Keep in mind the Rushdoony quote was written in '69, before the "hippies saved physics"...
"History is not simply a matter of the past causing the future; it is also true that the future causes the past, as R.J. Rushdoony explains: 'The movement of time, according to the Bible, is from eternity, since it is created by God and moves out of and in terms of His eternal decree.... Because time is predestined, and because its beginning and end are already established, time does not develop in evolutionary fashion from past to present to future. Instead, it unfolds from future to present to past."
Ref. Pg 171 at the following link. It's a commentary on the Book of Revelation by David Chilton. You should peruse through it some time... It might just make you postmil