Looking for better gains? Try going slow.
Slowing your reps down is a great training technique for those exercises that are otherwise difficult to isolate the proper muscles.
Slowing down allows you to squeeze the muscle better at the top of the contraction, which works the desired muscle a bit harder.
Slowing down also recruits more muscle fibers. In the long run, this will make you stronger, so you will be able to lift a bit more.
Slowing down aids in avoiding injuries. If you are not throwing the weights, you won't have to worry about pulling or tearing muscles.
Next time in the gym try slowing down your reps to a 7-second count(3 seconds on the concentric contraction and four seconds on the eccentric). I think you'll agree you will get a more thorough work out. If you are already using this count and you still need more gains, try 10 second reps: 10 seconds up and 10 seconds down.
This makes for a very challenging workout, but here is a hint: use a a slightly lighter weight when lifting this slow. Chances are, you will not be able to lift the same weight at slower speeds.