The past few months, I've put my chest focus more on lower pec and have been happy with the results, both in size and shape. I have had good success with weighted dips (you need a belt with a chain for this). They should be done leaning slightly forward, going down slowly as far as you can go. Then fast up. I do around 4 sets, with progressively heavier weights. It will work your tris and shoulders a bit, but if you are doing it right, you will feel it in your pecs. Lately, I do a heavy chest day that includes dips and cables (standing and doing low flyes from top down or from bottom up). Later in the week, I have a light day and I do just decline barbell. I think dumbbells would be better, but that's a problem in my current gym. If I am ambitious, I do 3 sets of cable work.