I vary the grip from time to time. Really narrow benches may work your triceps but it also works your inner pecs.
On chest day, which is tomorrow, I do flat benches, incline presses and decline presses. I vary the grip on these which seems to work the entire pec area. To finish off, I do flys and pullovers. When I am done, my pecs are really pumped as you might imagine. Sometimes I add in cable flys. I really squeeze my pecs when I bring my arms into the center. I am trying to increase my inner pecs, obviously.
On way to keep shoulder involvement to a minimum is to work you delts the day before. This way they are too tired to get involved. LOL.
I took a month off from the gym. I started back on Monday this week. I have really been hitting it hard. Feels fucking great! But I am sore. Love that feeling!