Thanks for the update. I thought that might be the problem. Here is one example of getting the fabric through the dogs and keeping it straight. You can use painters tape and build up layers. Place on machine bed so you have the 1/4 inch seam.
https://www.youtube.com/watch?v=DSCBzwJ1lB4
Another one for you. I have the same bobbin cover and it helps with the 1/4 inch seam.
https://www.youtube.com/watch?v=t2KremZ6rB8
One more tip that I use. Mark the 1/4 inch seam so you can see it on your fabric. You want to watch that line go through the presser foot. Don't watch the needle. It's like driving a car down the road.
I still mark seams even though my machines have laser lights. Hope that helps!