I usually piece with an 80/12, and I usually quilt with the same (my Elna doesn't seem to be picky). I grabbed 75/11 by accident. I did try the 80/12 needle last night, same result. Just decided I'd go with a new quilting needle for tonight's test.
I've never used a 14 for anything. Though it's in my basket to buy along with some Superior threads (since it's the needle recommended by Superior for the threads I'm looking at). Would that make the stitches look different (such as improve the definition of the stitches on the back on Auto tension?)