When FMQ , you don’t actually have to see the stitches where the needle is. I would put on the original foot where the tension is good and you want to be looking where you are going to stitch in ADVANCE of the foot.
It also is helpful if you Machinger or similar gloves to help move the quilt. It is also helpful if you can set your machine at a comfortable speed so you don’t have to worry about machine speed, just moving the quilt. You are never going to get the same evenness of stitch length that you get when the feed dogs are up for regular sewing. Practice makes perfect and good luck.