Sorry you're having so much trouble. Try this, it helped me. Take 3 pieces of fabric cut 6" long and 1 1/2" wide. Sew them together. I used one white piece in the middle and the outside pieces were dark, so I could really see them. Press as you normally would and then measure the center or white piece and see if it is 1" wide, should be. If not you may have to made your needle position until you get that 1" strip in the middle.
I had to do this several time until I got it just right, but it will work.
Good luck, Pam