The correct for of address for Archbishop Montalvo is: "The Most Rev. Gabriele Montalvo." The correct salutation is "Your Exellency;" and the complimentary close is "Asking the Your Exellency's blessing, I am, Yours respectfully, (Name)."
I think part of the reason these Cardinals and Bishops acted so scandalously and with impunity, is that they are just treated too deferentially by the laity.
I would write to Mr. (Fr.) Montalvo:
Dear Most Excellent Dude,
The jig is up. The decades of arrogance, hypocrisy and condescension of the high-level clerics toward the Word and toward the true Church and faithful, is about to come to an end. And none too soon. You guys have been read the riot act, over and over again, for the past THIRTY years, by the Wanderer folks and other orthodox Roman Catholics. You totally blew them off (sic).
My advice is for you to resign, and have about two-thirds of the hippie, heretical, cathedral-destroying, homo-enabling, American Cardinals and Bishops do the same. Likewise any of the multitude of priests who want to get out before the indictments start rolling off the assembly line. And, can you guys please pay for your own lawyers, like I do? I'd like my Sunday offering to go somewhere besides down a rathole.
Asking for Dude's Most Excellent Blessing,
Respectfully, caddie
I think that letter has the appropriate tone.