Chinese rubber lens hoods in 77mm and 67mm. Might help. Always worried about vignetting.
For a minute, we actually had FOUR Deardorff 5X7s in the house. That's mine in the middle with an Ektar Wide-Field 190 on it. Close one in an incredible rebuild by Ken Hough. Far one just got a new bellows from Western Bellows in LA. (which is closing) There was one more in a box going to Western Bellows for a new bellows.