I don't get this. I'd like to see a picture of you to see the picture more clearly. You basically just seperated the chest into 4 different parts. If there is an outer lower there must be an outer higher, inner lower, and inner higher. While the pecs are a fairly large muscle group, I don't think it's possible to target such a specific area. Probably just genetics.
It looks like you're looking for more outer pecs than lower, and really the flabbiness is probably more to do with bodyfat than muscle - do you feel a pec line and not see it?
Keep the Dips and the Flys, I'd drop the decline presses myself and switch to flat or incline. What weight are you using on your exercises, I only ask because someone benching 225lb for example is wasting their time with 30lb flys like so many do, use some heavy weights on those suckers and make sure to lean foward on those dips.
My favorite routine that gave me the best results like you're after was: Seated Med-X Press Incline Barbell Press Flat Dumbbell Fly Dips
I'm 18, been lifting for 3 years and seriously 2 years. I weigh 185 and am 72 inches tall. I recently started using dumbells over BB's. I did 160x10 with the BB's and now I do 65's with the DB's. I'm 10% bodyfat so no i'm not fat. From 6 months my bench has increased about 20 pounds.
I use 40's for 12 reps for my DB flys and have been progressing on them. What did your rep ranges look like on that workout Tomato?
I wouldn't worry about a specialization program per se, just really concentrate on doing your chest exercises in good form and as heavy as you can. I'd probably go back to Benchs with a bar myself and dumbbells as well. A good sample would be:
I prefer the second one myself, but the point being that you are getting a heavy barbell exercise, a heavy dumbbell one, a dumbell fly and dips with either one.
Just focus on lifting heavy and with good form, and make sure you aren't doing too much frequency or volume, and make sure you are doing enough intensity and frequency, etc. Basically if you can work chest every other day, in my opinion, you aren't intense enough, and if it takes more than 5 days to recover than you are doing too much volume or intensity.
Stick with it, at 185 at 6' you aren't a slab of mass, but you can have well-developed chest muscles, but I'll bet that by sticking with it and getting about 10-20lbs of mass you will be quite happy with your development.
Also consider lower reps like 6-9 and see how that treats you. Also consider the picture you gave as an example, besides that guy needed some upper pec development, he has quite a bit more mass than you could have at 185. Something to consider with your goal.