This has helped me. I think part of it is that in order to narrow my grip, I've really got to stick my chest out and keep it that way. Once I do that, I tell myself to pin my elbows to my rib cage. Sometimes I think more about my elbows during the ascent than my hips.
Thanks for the tip. The chest issue is coming mostly from shoulder mobility. I physically can't pull my shoulders back more or bring my arms in more. Often after a set of fahve my triceps ache so horribly that I can't unwind myself from the bar. Believe it or not it's gotten better in the last month with lots of low bar stretching.