Want to maximize chest recruitment? Do 5-angle flyes.
Various angles of adduction are necessary to maximally recruit the pecs from the clavicle to the sternum. This exercise will hit most of them to stimulate new growth.
As you fatigue in one position, adjust the angle to a new position: high, mid, low or someone between those angles. You can even go back to a previous angle. This also allows you to extend the time under tension, one of the key components of hypertrophy training.
If you want to build huge muscles, you must continually challenge them by placing a greater demand upon them. If you stick with the same stress level month after month, you'll quickly reach a point where your body is used to the stress and won't need to adapt (i.e. grow) anymore.
Being strong isn't enough. You need to be strong for your size. That's the difference between relative strength and absolute strength. Here's what will get you there.