Been reading a lot of the writing of Paul Carter from "lift run bang" (gayass name I know) and he gives great merit to high rep sets for hypertrophy, recommending a few methods such as getting 50+ total reps in 3 sets to failure, light 5-6 sets of 20-30 reps for arms, delts and leg extention and leg curls as well as 100 rep straight sets.
Have switched to 5x20 for arm work as well as 50 rep sets for laterals, rear laterals and neck work 3x per week. The laterals cetainly seem to have helped, too early to tell for the arm work but they look slightly more pumped and a bit more vascular, will give it 3 to 6 months like reccomended but seems good so far