I wouldn’t mess with the 1-2 inning each formula for Ziehl and Walters at this point. You can stretch Gallo or McFarlane if you need more or a new starter.
I haven’t changed my mind from last week: In a close game, your options are Walters, Ziehl, McFarlane, Gallo, and Arguelles. I can live with Rafe if you must use a lefty, but I’d stick with those five.