Leave the breast whole and slice when cold. If you slice tonight you may lose too much moisture. Putting it in the ziplock bags overnight. I wouldn't use foil. That may dry out the breast.
Team: Pyle's BBQ; Yoder YS640; Good-One "Trail Boss" 60T; Weber Kettle w/rotisserie ring; Big A$$ Rotisserie; Weber OTS; New Braunfels offset smoker.
Saddles BBQ Bistro