HD, don't make me get all nit-picky on you... it's just that the preamble you proposed sounded very apologetic... "Well (digging toe in ground), I realize it's been a week since I bothered you with this... but here goes and please don't get mad..." KWIM?
So what if it's awkward. What's more painful... a second or two of awkwardness or giving your W enough words to tongue-lash you with? Awkward-shmawkward. No one ever died of awkwardness.
How did you do it the first time you made the statement? Was there a preamble then? An appropriate preamble during Grey's Anatomy might be to wait for a sexy scene and then say, "That reminds me: I want to ML with you once a week."
Just bear in mind that ANYTHING you tack on in the way of disclaimers, prefaces, frills, addons, will just give her something to attach to... like a barnacle or an oyster.
Go back and read the dialogue you wrote about the first time you made The Statement. And the posts right after that. They were brilliant. Gichyseff in that frame of mind again.
Re: iterate/reiterate-- I was just grasping at something I could faux-bitch about. Not a big issue. But it does illustrate that she can/will make a mountain out of any molehill.