I understand about the profile, and I kinda assumed questions like that when I asked this, so, no offense taken

No implants and don't plan on any, my family has always been very busty, DD's are common place and I should note that I'm still at "the beginning" and not yet fully developed in the chest, hence my concerns. If I can't learn this and figure it out, how will I manage later (and I hate the idea of going braless).
All the sizes I've tried are a 40 band (better to be a lil bigger than smaller for comfort). I've tried C, D, but as I said in my first post, the problem is the cup size more than anything, I fill a C cup enough that I even have a little cleavage, but going to D and larger (as measurements suggest), I end up nowhere near what it would take to fill it, but the C cup also isn't completely comfortable, it digs in spots and causes "bulging" in others.
So, what value do the measurements have? how do you use them to find what will fit or not? I'm truly at a loss, which is why I posted only measurements when I asked, because I figured I had to be doing something wrong to be having so much trouble.
SoShy