FavadiCacao, I'm by no means an expert, so this may not help. I find Panache etc bras suit women who have more bottom heavy breasts, while F/F/CK suit women who have comparatively more flesh in the top of their breasts.
Even wearing the right size Panache, I will spill over the top, and a friend of mine wearing the right size Freya doesn't fill the top bit of the bra.
One suggestion, so you don't have to pay postage, is to order lots of different bras to be delivered to your nearest John Lewis, if you can afford the up front costs. Then take them home, and you'll have 90 days to try them on both on their own and with your clothes over them to see how they work.
With the measurements you've given on the other thread, you are either 30" or 32" around the back, and then depending on which one, either HH or GG (though brands vary).
Was the Fantasie bra you tried on a balcony bra? If yes, I would try more of a plunge bra, but not the Freya Deco bra because that is hugely cleavage enhancing.
From these:
Bras in your sizes in F/F/CK brands from John Lewis
I would definitely try the Freya Pansy plunge balcony bra, the Curvy Kate Dare plunge bra and the Fantasie Melissa full cup side support bra, as a first start. Buy them in 30 H-J and 32 G-H, and then try them all on and see what works best. At John Lewis, I think only Curvy Kate does over an H cup, so try some more bras in that brand. More choice on Figleaves, but then you start factoring in having to organise posting the ones you don't want back, rather than just dropping them off in John Lewis.
Hope some of this helps!