Please tell us more.
What kind of issues are you having with the blocks? Are the fabrics getting stretched as they are sewn? Do you have a picture of the issue? It could be the technique of how you put them through the feed dogs.
I keep my index finger along the right hand side of fabric to help guide into the feed dogs. Left hand tickles the fabric along. The other tip is to hold the end edges of the fabric together. That helps feed them.In between that, there are stops with sewing so I can position fabrics as needed.
I use the WF for adding long borders. It helps feed the two fabrics as they are stitched.