you can always get some basting spray. sulky or 505. since you took it apart, that would certainly help you.
you spray the backing and smooth the batting over it. then spray the top and smooth over the batting.
i tend to use fusible batting-i'm lazy and old!!
oh, i see it's done. great quilt. meandering is fine. if you have trouble doing straight lines across a quilt, simply wiggle to the left and wiggle to the right, meandering across. looks great!