very good points you have made here, as when i came over to calvinistic theology, indeed run into the situation at times where some seem to regard the System theologies and the Confessions to be on par with scriptures.One of the issues at work here (and in the discussions referenced by both parties) is the confusion of systematic theology and biblical theology. We all have a "systematic theology" where we make logical inferences from the biblical text. A biblical theology is, on the other hand, the complete story-line of scripture from Genesis to Revelation. Not all of our systematics are good; but, then again, not all of us have a good biblical theology either. And, if your biblical theology isn't good, your systematic theology will be quite bad.
The endeavor of "theology" has to start with biblical theology, progress to systematic theology, and result in proper application to one's life. If any one of those steps is skipped or is, in some way, defective, the whole process turns into what we generally see on this message board.
I've had friends who essentially argue logical conclusions based on their systematic theology. The problem is that you can logically leap past biblical theology because you are now two steps removed from it. In this case, you have constructed a theology based on people's theology rather than a biblical theology. The biblical text is, of course, our home base. Logical inferences from the text and storyline of scripture are unavoidable. Dogmatic and inviolable conclusions made from a systematic theology (rather than a biblical theology) are to be avoided because systematic theologies are not infallible.
In my experience, many Calvinists revere systematic theology more than the biblical theology. In doing so, they construct a new type of theology that is, again, too far removed from the Bible itself to be trusted.
We know--according to biblical theology--that God is absolutely sovereign and man is free and responsible for his actions. We also know that man is never presented as having a so-called "libertarian" free will as he is bound to the laws of the Creator and His universe. In creation, God did not make equals; He made creatures. Nevertheless, man's actions in scripture are presented as being free (Joseph's brothers sell him into slavery of their own free will and decision making process). Yet, God is presented as absolutely sovereign--even over the free and sinful actions of man (Joseph's brothers freely do what God has ordained they do, yet He doesn't cause their "evil"). So, there is a tension between the sovereignty of God and the will of man, but biblical theology provides a welcome corrective to both sides: God doesn't cause the brothers to sin against Joseph nor does He "turn" their actions for good.
The Archangel
Woudl be good to have one use the Zondervan Niv sb, as that one uses biblical theology as its main way to view the scriptures, and complement that with the esv SB, who uses the Systematic theology approach!