At first glance, you're split is pretty classic and people have grown just fine from it. You're not hitting your chest as hard as you think you are or you're not eating. Is everything else growing?
Worried about overtraining on a 4 day per week split and 4 exercises for your chest? I think you're making excuses.
And, unless you're like 5'5" and a ripped 180, a 270# press probably isn't the recipe for 'shitastic chest'.