There are three main mechanisms believed to cause hypertrophy: Mechanical Tension, Muscular Damage and Metabolic Stress.
Your current scheme is emphasizing mechanical tension and while that's a good thing since it tends to promote sarcomere hypertrophy, there are some things you should think about.
1) To keep increasing sarcomere hypertrophy you need to keep increasing the tension by raising the weight, both in absolute terms (raising your 1RM) and in relative terms (as a percentage of your 1RM) Beginners can make great gains at as little as 50% of 1RM while advanced trainees may need to go as high as 90% of 1RM to see any progress. (most of us are somewhere in between)
2) By using the same protocol all the time you're leaving out gains you could be getting from sarcoplasmic hypertrophy. In order to take advantage of that you need to focus on metabolic stress, essentially a combination of lactic acid, reduced oxygen and cellular swelling. In other words, training with increased volume. Consider alternating your more strength based workouts with a more volume based protocol like say 4x10s. For exercises where the end position is difficult to maintain, bent rows for example, you could accentuate the effect by holding the weight at full contraction for a bit before lowering it. (not necessary, but an interesting variant)
3) Muscle damage tends to be greatest in the eccentric phase of the lift so some options to work on that include adjusting your lifting tempo on the down stroke or lowering weights that are greater than your max. (make sure you've got a spotter if you're going to do that of course) This protocol is pretty hard on recovery so use it sparingly.
Of course some other issues could be that you just need to do some pre-exhaust work to take the other muscles out of the picture or change your grip/posture/form to emphasize your lats more.