Oh, one other thought. I’ve noticed some kickstarters release endless new versions of the PDF before the “final” one. We didn’t do that either. As far as I can remember / divine from the old kickstarter page we sent out exactly one version, the final one. We also published, right at the start and for anyone to download, a “barebones” version as a sort of “try before you buy” product.
Not sure if that was the right strategy, but I can say that as a backer I don’t generally download a game until I see the word “final” in the title.