Your logic is flawed.
You left out the part where your choices are predestined as well.
Whether they were predestined to happen as they happened or not has absolutely no effect on the fact that they were
your choices.
He simply decided beforehand which events He would and would not "allow" to happen.
I put "allow" in parenthesis because He is said to be omnipresent and active in various ways. If He were not - not only would the things that happen not be able to happen - the ones doing them would not even exist.
"In Him all things consist." and "In Him we live and breath and have our being."
That isn't true. You can make or refrain from choices that will prove you reprobate.
God uses means to bring about what He predestines. In this case it is the choices of sinful men.
Yes we are exactly as designed and (in the case of fallen man) as that design has become because they has been cursed by God because of their choices.
In the case of the elect (new creations in Christ) we act as designed as well.
Very impressive!
I agree with the WCF in that. Nothing in that statement says anything about the choices men and angels make along the way which results in their final state.
God uses their choices to bring about what He has predestined to occur.
The bottom line is that you read what you want to into what Calvin and the WCF said.
If Calvin or the WCF or I wanted to say what you accuse us of saying then we would have said it.
Your entire paradigm is nothing but a red herring IMO.