K.I.S.S (Keep It Simple Stupid) should be applied here: Why anyone thinks that "spliting" up a back workout makes sense may need a reality check. Trying for a separate workout for width and another for thickness, a person must have not spent serious time doing DL's, chins, BB rows and other quality back movements.
Try working with serious intent on:
DL's (rack), BB rows (curl grip) and bent arm pullovers in that order, in the same workout, twice a week for the next 3 months and your concerns about width and thickness should be solved. Good Luck.