Thanks all! I do have a 1/4" foot and a graduated throat plate. I find it really hard for some reason to follow along the edge of the foot so I am lining it up just a hair before the 1/4" line on the throat plate, which pretty much lines up with the edge of the foot. It's easier for me to follow the line for some reason.
My next project, I'll probably do all the "tests" to check for a true/scant 1/4" seam. I'll also experiment with my other machine.
The credit card thing is an interesting idea...I do have painter's tape but admit I am hesitant to stick it all over my FW...