I'm around a 32G and have had exactly the same problem. I found the Freya one ok but I prefer this one
Then I found this brand and it's AMAZING! Can't recommend it highly enough. It actually lifts them up, looks pretty and sexy, is really comfortable, and is easy to unclip for feeding..
Now I'm not feeding every 5 minutes I often just wear a normal underwired bra and yank it down to feed.
Good luck!