Hi there,
thanks a lot for the pictures! Looks like you're doing this with a fairly decent sized quilt. Mine was only 30 by 40 or so. I did indeed not pin enough, and also, I think I didn't iron everything as flat as I should have. Though I should know better by now, every now and then I still try to take shortcuts and think a certain step isn't really necessary, but every time I get punished by having to redo something. Maybe this'll teach me ...