Rather think about squeezing your lats, glutes, and putting in an arch in your back. mild arch, we're not talking gymnastics here. Just squeeze your spinal erectors along with the lats/glutes. Look about 10 feet in front of you as soon as you grab the bar--pick a spot.
Chances are if you just think about putting a mild arch in your back along with the lats/glutes squeeze you'll bring your back right into flat neutral where it needs to be. Flat is what you want.
I think if you get your back flat your hips will drop anyway, so it works. And if they don't you'll probably be fine anyway--if the hips are the only things a little high you'll be fine and pulling stronger regardless.