1)
Why did both the Sar ha'Mashkim and the Sar ha'Ofim insert the word, "ba'Chalomi"?
1.
Ohr ha'Chayim: Each of them dreamed also the interpretation of the other's dream (Berachos 55b). 1 "Chalomi" means specifically what I dreamed about myself.
2.
Ha'amek Davar: There were secondary matters in my dream - but I saw something that I recognize is a true dream (prophecy - which I will now relate to you).