Hi, have a lie down. Eat some chocolate. Breathe. If you read lots of posts on this site, 1/4" feet on most machines are not really 1/4". You have to move your needle (if possible) or do like you are doing with another fabric guide. Here's a good tutorial:
http://www.quiltingboard.com/tutoria...ce-t89997.html
The 1/4" foot is approximate. I have one and have to change my needle position if I change thread size or go to flannel or homespun from just quilter's cotton.
Another alternative is if your quilt is made out of just the pinwheel blocks, then go with the 12.25' ones.