I agree with Lol.
If you have been doing HST for a year, your should have huge strength (and size) increases by now.
Bottom line is, if you are not adding weight to the bar (over time), then you are not growing. I am always looking to push my rep maximums higher EVERY CYCLE! If you are using the same weights from one cycle to the next, then you are not training hard enough, eating enough, or not sleeping/recovering enough.
Your muscles need stimulation to grow, and progressive LOAD is key. This means every cycle your weights should be higher than the last cycle. Like Lol said, even if it is only 5 lb.s per cycle, you need to up the weights. And focus on heavy compound movements, so it is easier to increases the weight each cycle...forget DB laterals, do standing barbell presses for delts! Forget things like flyes, leg extensions, any isolation exercise. You need to INCREASE YOUR STRENGTH, USE ONLY HEAVY COMPOUNDS until you get out of this plateau.