Ah, bee. what a shame you are feeling bad about your dress (which you look lovely in).
I re-read your post to see what you wanted, and it seems to be ‘support’, so I’ll try to give that as well as my own experience.
I’m also larger busted but not as much as you (about 30E when I got married) and I’m fairly short and hourglass shaped. We both have a good bust so let’s be grateful! There are worse afflictions in life! 😉
The funny thing is that you are blaming your dissatisfaction on your larger bust but my dress was totally different to yours (a corsetted mermaid), and I’ve seen bees with your shape in more sheath like styles as well as ballgowns, so try to think that actually you DID have a choice and you just grativated naturally to the Penelope they way I gravitated to my mermaid.
But I’m a bit sympathetic. I have to say I did feel limited in what I wore because being so curvy, I have to have clothes quite well fitted at the waist or I look a lot fatter than I am. I adored the backless look but I knew I’d look dumpy without my boobs lifted up, so I tried dresses with all those gorgeous pretty little buttons down the back but in the end I went for a corset as it provided the best lift.
In your case I think the dress could maybe do with a bit more lift so I would get the back filled as you suggested, or straps added, plus I recommend a very structured strapless bra like the Gossard Ultraboost or Wonderbra strapless ones (the latter has the best lift with a looser dress, the Gossard is better under a tighter dress) – they do come in big sizes.
I saw a comment the other day by a bee quoting “I have two weddings- my real one and my Pinterest one”. I think the same applies here: “I had 2 wedding dresses- my actual one and the one I’d have worn if i were 50lbs lighter/4 inches taller/small busted/bigger busted/more olive skinned/younger/older etc etc. It can be annoying but you have to work with what you’ve got. And almost everyone here on the bee has some ‘flaw’ or doesn’t suit every dress. Probably less than 1 in 10 bees could wear ANY dress.
I think you are judging the dress too harshly because it’s just a phone shot in a changing room, no make-up, veil or jewellery. You will look stunning when your day comes. I googled this dress and it’s super pretty. You’ll be surprised how the accessories bring the look together.
Keep looking at other brides wearing your dress on line to inspire you, and then move on from the dress to the more fun bit of how to accessorise it!