Try widening your grip. The closer your hands are together the more emphasis the lift has on your triceps. Also, make sure your back is flat on the bench the entire time, not arching, and don't bounce the weight off your chest at the bottom.
If you're already doing all this then I'd probably say that you're just not feeling it as much because the bench press IS a compound lift and it DOES work a number of different muscles. So if your chest is really strong but you have weak shoulders and triceps your bench will be lower, and it won't work your chest as hard.
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