Hi there!
Have you considered Sharon Schamber's "board basting" method ? I believe her tutorials show her using the method to hand-baste, but I use the method for spray-basting. Once you get the hang of it, it's very fast. I've been doing it this way for years now, and never have any pleats or creases.
Instead of "floating" the batting as she does, I start out with the backing on one board (you could also start with the top) and the batting on the other board and spray-baste those two elements. Then I continue with the basted backing/batting on one board and the top on the other board and spray-baste those two elements together.