What basting spray did you use? Sulky spray dissipates after a short time. Some other sprays also lose their binding properties when exposed to air and they work more as a temporary adhesive.

I haven't had good luck spray basting anything larger than a wallhanging. Pin basting or thread basting really eliminates the puckers. Combining that with a good walking foot, flat surface area and starting out in the middle of the quilt usually you can avoid puckers.