Thanks for the feedback, everyone. My one buddy showed an older pic at ~180 pounds and proportionally, he looked the same even when a lot leaner/slimmer: Wide lats (should be see during a front-relaxed pose), good shoulders/arms, relatively flat chest.
BTB -- you are likely in that same body-group, from a height and size perspective. Interesting.
Facz -- I do agree that reducing BF would show true(r) shape.
Rich/5kg -- I like the idea of using a different rep tempo with DBs. I just wonder about tricep strength again, but I suppose the rep tempo takes care of that and forces the chest to work more.
I feel mostly at a loss on this topic as my chest development came first (to my detriment as it caused shoulder issues) and I've been playing catch-up with my back ever since.
Complication makes it easy to explain failure.