Sculpting my chest by weight lifting?

I work out quite a bit. My arms are quite cut and strong but my chest lacks power and appearance and isnt up to par with my arms. When i lift arms and chest i try to focus on the chest but i dont know what does the trick. I do dumbell bench(incline and decline) and flies. I dont know how else to focus on my chest and to make it get bigger. should i widen my grip on bench? Any suggestions?