That gave me problems for awhile also. Better cutting help me tons. And putting a wall of tape on my sewing machine to make sure I had exactly 1/4 inch seam. heres a pic of a wall of tape. I think once you get the seams more accurate they will be easier for you to line up. And pressing your fabric towards the dark always. Pin those seams if you have to. The first couple of quilts I made when putting the blocks together they never matched up, in order to match them up I had puckers. Cutting and 1/4 took alot of the aggrevation away.
Run a piece of paper through your machine with no thread then measure to make sure its at 1/4 in
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layer 15-20 strips of tape, I use painters tape becasuse its not so sticky
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Straighten the edge at the cutting board
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I like to place mine right next to the presser foot then move my needle back and forth till I'm at a quarter inch.
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