Where on your chest are you trying to get it to?
If I lower it to just below the pecs (sort of powerlifting style) then I use a lot more of my lats than normal. When I lower it to my neck, it builds the chest the most and hardly uses the tris or delts at all. So, depending on where you are trying to lower it will have an effect. Try different areas and see if that still does something to your back. Your setup might suck too and you are not in the right position.
People too weak to follow their own dreams will always try to discourage others.