I find nothing in Calvin's writings that would suggest such a thing. Could you please provide an example?
As for “semi-pelegianism”, the modern “big box churches seems to have gone past the “holiness”phase to methodism/evangelicalism to full-blown pelagianism.
Your statement isn't far from the truth. Augustine called anything that aligned itself with "free will" Pelagianism. While there are plenty of Protestant churches today that would fit that category, I would also suggest reading what the Council of Trent had to say. They also went down this same path.
You will have to show that Augustine taught anything close to double-predestination. In any case, Augustine did what many contraverialists do, and carried his arguments to logical conclusions that were soon rejected by a church synod. The eastern fathers, who are certainly as authoritative, did not belong to his school. Sometimes culture colors theology, and Augustine was an African ever bit as stubborn as his Donatist compatriots, whom he had to bully into submission.