I'm a 34e and I'm sorry to say that thw wonderbra ultimate is the best strapless ever!
Can you not take your dress to the shop and try it with a 34f, with the aim that it will "stretch" in time to be a 35" F? Try with your dress though and tip your headupside down and jiggle your boobs as sometime it can look fine....... for about 5 minutes then you get 4 boobs!
I reckon for size 36A the Ultimate would be perfect minko. I've been and tried some others and they just don't compare, so I am going to get the 36F, it's a bit of a compromise on fit but still produces a better result than the normal style strapless bra.
Bra arrived today, I am so pleased with it. This is the best strapless bra by miles, unlike all the others I tried it gives fantastic support and holds everything in without squashing you flat. Pushes up and together and lives up to its claims, you can jump and jiggle and dance about, they do not budge.