You really need chest big time mike, arms and delts are set as njflex says.
You are holding ton of water, I'd get on the dry stuff PRONTO and clean the diet up quick; if you can get into shape a few weeks before hand you can grow into your show and come in bigger- plus the added effect of the muscle growing and pushing out against the skin, as opposed to getting big as fuck and dieting down and having loose skin (And thus less definition), this will be a better look for you man.
as for your chest, you need to hammer the fuck out of it cus your like the white phil heath in that regard. dont train arms or delts you got those, throw in extra chest work, go 2x a week and you can improve it a good deal- it won't be dominant like your arms and delts because you are arm and delt dominant, but you can improve it a good deal. Do lot of pre exhaust work on that second workout, 5 sets of pec dec flyes or something, then light presses but strong contraction and full ROM nice and slow- anything to take your tris and delts out of the movement. I really like machine inclines atm, they give me a lot of control with my rep speed and I can easily adjust the weight or do drop sets or whatever I feel like. You havent really posted about your supps, and I understand why devils in the detail though, and the detail comes from the diet in combo with solid supp protocol and quality supps. training diet and supps all gotta be on point to get best result.
but liek I said put the work in now and grow into that show you'll look a lot better and have more pop, none of that flatness, more of a full blown look.