Avoid proposals! Even when I have the above items, I still add a final check.
Here is what I say:
“I believe proposals are written confirmations with details of what has already been agreed too, so let’s determine what we are agreeing too, and then I will write it up for your review, edits and approval.”
Bold? Direct? Assumptive? – Sure, and it also gets me out of the game of be being brushed off by a proposal request. Real buyers don’t flinch at this. Explorers, the perpetually curious, 3-bid policy followers, and other time-wasters always balk. Buyers just smile and answer.