HELP. I recently purchaed a Viking Mega quilting machine and Gracie table w/stitch regulator...I have practiced and practiced, but I have problems with the tention? and thread breaking. When I adjust the tension so the bobbin tread isn't too tight, my top tread breaks. When I adjust the top thread so it doesn't break, the back of my quilt looks like a birds nest.... I am totally frusterated! I have switched types of thread and needles. I am at a lost. I have things so screwed up with my tension, I'm not sure what to do now. The past few attempts go fine for 4-5 inches, then it skips several threads (almost like tacking) and then the thread "freys". Any help would be GREATLY appreciated...