Okay, I had to really think about this, and I didn't want to avoid answering since I'm primarily an R/S shipper.
All of the episodes listed have bits of interaction between Malcolm and Hoshi, but none of them are overt shippage, although Shockwave II has that great scene with Hoshi showing up at Malcolm's door without her shirt that reams of fanfic have been written about.
I finally decided Sleeping Dogs because, while there isn't any shippage (except perhaps for that decon scene at the end, and Malcolm must be thanking his lucky stars because he's the only man in decon with two gorgeous women), it shows them really working together. And in the end, Hoshi is the one who comes up with the solution to their problem, suggesting they fire all the torpedos at once, instead of one at a time. We all know how Malcolm likes explosions.
Plus, Malcolm gets knocked down by the Klingon woman in front of Hoshi and T'Pol, which had to embarrass him. Reminds me of when I met my husband for the first time -- he rides up on his motorcycle, all tough looking and biker attitude, and then promptly drops his motorcycle on its side.
Old enough to know better, but that's never stopped me before.