Row it down. If you have a good setup, you NEED to keep that tightness, or else whats the point of your good set up? This is crucial when shirted benching, obviously. It's something I've struggled with.
I'd lower the part perfectly until I was about to touch, and then ALWAYS I'd just let it drop , hoping for a touch, and resulting in a lot of missed benches. Anyway, I don't know if this question if for a raw or a shirted bench, but I'd say not to rush the bar down, either way.