You said that your thread on the back came out very easily, and this leads me to believe the the upper tension is too loose--you could trying tightening it SLIGHTLY by turning it toward a lower number. The "golden rule" in tension adjustment is: If there are problems on the back of the quilt, the problem is with the upper tension. Tension problems on the top (this hardly ever happens) then the problem is with the bobbin tension. Alway adjust in very small increments.
I also really love spray basting. You just need to take your piece outside to spray--even if its really cold--you are only going to be there for a second--and spray lightly and quickly. I usually wait until DH is around and he will hold it up for me as he hides behind it so as not to get himself sprayed! Good luck and let us know how thigs turn out for you! :thumbup: