One More Try's custom Dolphin build has a workaround for bloom scaling issue, you can try using it: https://forums.dolphin-emu.org/Thread-custom-debugger-2020
Download Debugger2020_2.7z, extract in your Dolphin folder, run, enable EFB exclusion slider in the advanced graphics options and see if it will have any effect on the bloom ghosting.
Download Debugger2020_2.7z, extract in your Dolphin folder, run, enable EFB exclusion slider in the advanced graphics options and see if it will have any effect on the bloom ghosting.