I'm sure this has been said before, but I'll chime in anyway.
After having been stuck at a whole slew of elements (for almost the same micocyles actually) for literally about 7 months, I slowly began to break through and master them one by one recently.
I applied the technique of simply trying to add at least 1 total rep to my workout each time. This helped to slowly inch my strength up.
But one thing I noticed that each time helped get me through the plateau was taking a look at my technique. Really getting in and analysing it and seeing where I could "save" energy in it. Because I saw that part of what I had to do was to become more effecient at the exercise, as well as make sure I'm doing it right (which incidentally are usually the same). I saw that a by product of powering through things was to just tense everything, and usually miss loading the correct muscles in the most effecient way.
So it wasn't just about simply trying to power my way towards another extra rep, but constantly, consciously being aware of and trying to be more effortless with my form (not the same as cheating to make it easier).
As an example: the big cue that had me master HBP/P2 pushups (after being stuck at 4x12r for months), was to actually engage and push from particular muscles of my back, which helped me to keep tension in the bottom portion of the movement and therefore not "bleed tourque" as Kelly Starrett would say. I saw that everytime I went down to the bottom part of the push-up, I was dumping the tension with a slight sag which would load up my tricepts even more, and was wearing them out very quickly. Instead I concentrated on hitting the bottom part of the movement with this slight tension in my upper back which stopped a loss of tention, and thereby took some of the unnecessary load off of the tricepts (I think anyway...!).
So, basically part of getting better at an exercise is not only powering and grinding through it, but also feeling how to do it with only the necessary tension in the correct places and not wasting energy with unnecessary tension. Everytime I've gone in and done this with exercises, I've broken through my plateaus.