Walking feet can vary widely in quality... I tried several before I found one I liked. I loosen the foot pressure a little when I use a WF.
Even though I have quilted dozens of quilts on old machines, I still have to do a test sandwich beforehand.
If you have a Minkee back, then you will have to adjust more- same for denim. And each batting has different thicknesses, so test sandwiches are the way to go. How does it do with the regular foot?