Master is very good when he is one cut and then straight downfield. I think we have all seen that he isn't so great when he tries to go wide. He just doesn't seem to have the lateral quickness to get to the corner.
Why doesn't Day ever have him lined-up offset and then have Fields pitch it to him wide so that he's already outside the tackle box and can just cut it up field? The old Kevin Mack/Cleveland Browns late 80s play. Mack and Master Teague are so similar size-wise and similar running styles. I really think that play would be effective. Could also run the same set and give Fields the option to pitch to Teague or keep it and bootleg it back to the opposite side.
[Mod edit: Closed until you fix your title.]