Feathering as I know it is a technique for preparation of the restart location on open root groove.
Able to see where you restart- if you are talking about the root side, yes the feathering technique that you apply could be the factor. For the face side I don't believe feathering should be anywhere near it. Without seeing what you are doing oe even seeing what you have done it'll be hard to help. To get a better looking restart try stiking the arc a little higher in the joint than where the actual restart is flow back to the last bead end retart your vertical progression. Remember to look at what the arc is doing as you weld, maybe wiping the smoke of the face shield cover lense prior to each retart will help. Don't be dicouraged the skills will come with time remember practice, practice, and more practice .