Good advice:
Along with young buds of almost any tree, tree nuts, ground cover leaves, grapes, etc. Don't forget some thermal cover. They need a young emerging forest. Give them what they want and they will stay.
Addition: Ground logs and stumps for drumming. A water source is always a plus. Water seeps and rivlets.
https://www.ruffedgrousesociety.org/grouse-facts 
