If you keep backing off the hard exercises or the exercises that are the hardest, how do you plan on getting better at them?
On another note, I would eliminate the Decline presses, they are a waste of time.
Also, there is definitely no need in wasting your time with three flat pressing movements! Do one, lower the volume to two or three working sets heavy with rep ranges of 6-10. Swap out those three movements every chest workout or do DB then BB, or vice versa. The smith maching flat press is the exact same as flat BB with free weight. You are over training, and that will will impede any progress you are trying to make.
Start working at getting better at your Incline presses and if you are only doing three or four exercises with two or three (max) sets you do not have to worry about "killing" your chest.