Bella! I have tried a few things. One was similar to yours but the were plastic rings that I placed between my DIY domes and my chest. Smaller than my domes so they pulled my breasts through them. The other thing, don’t laugh, during this last 2 years I got into some kinky breast bondage. After pumping I would use a few devices to clamp my breast which holds the swelling. Yeah kind of strange but I think it helped enlarge my breasts.
Here’s my post there
https://forum.boundanna.net/board/viewtopic.php?f=12&t=13374