Wise, you are.

Sounds like you're satisfied with the results but sense that you could be more efficient. Nothing like doing long, protracted workouts on one body part to get results only to find out that other people are getting the same results with what seems like half the work.

You may be ready to embrace 0311's suggestion of more frequency and just redesign your whole routine to incorporate more frequent work for every body part.

If not, then definitely cut down along the lines that he suggested. Adding the pullovers is a good idea. At least it's something slightly different. Pullovers also are good torso builders and engage the chest, the serratus, the intercostals, and abs, as well as the lats. If you want to engage the lats more fully with a pullover type movement, however, you'll want to something like a straight arm cable pulldown rather than a bench style pullover with a barbell or something.

Further, along the lines of the Gymnast's Back Routine, in my own experience, I feel like the most efficient back workout I ever got was playing around on a pair on gymnast's rings. It wasn't even anything organized, I just messed around for a while trying to do things I'd seen gymnasts do, completetely random, and afterwords my back (my whole upper body to some extent) felt blasted like never before. I've actually considered trying some type of organized rings routine. I think it would be better than a stable bar.