If you have the bone structure and muscle inserts for an extra wide back, you should have no trouble to meet that full potential. Close to medium curl grip pulls (chins & bent over rows) call upon the lats more and seem to work well for most trainee's. But than again there are no absolutes in exercises. Wide may work for you much better. Have to find out for yourself how the body respones. Example; Like BP's may do nothing for the pec's, while dip can build slabs of muscle on them.
If doing DL's, or SLDl's, try to have the grip touching (or as near as you can) the inside collars. This extra wide grip give a great stretch and feel to the lat's. Consider the bent arm pullover, either BB or DB, as a top lat builder. This can be a great compound movement when heavier weight is used. The triceps, pec's and abs get there share of work also. If your gym has a quality pullover machine, with the elbows pulling, than by all means use that as a preferred lat builder.Good Luck.