Try doing barbell flat bench followed by incline dumbell presses, and then your next chest workout, start with barbell incline presses and then dumbell flat bench presses. Also do some type of dumbell flye, either falt, incine, or decline.
This is good training advice. Even though I rarely, if ever flat bench anymore with a barbell.
Really if you want a big chest you need to learn how to feel it first. Then use as much weight as you can with good form and a full ROM, for 5-12 reps.