Help: Excessive fret buzz on B string

Help: Excessive fret buzz on B string

Hello everyone.
I own a MM Stingray 5 from 2018 (a HH configuration) and I face since day one a problem of excessive fret buzz, especially the low B string.
I already showed my bass to a luthier who corrected the fret work which wasn’t that perfect in the first place.
I set up my instrument myself. I’ve checked the neck relief, and it’s ok. My action is:

G: around 2mm
D: Also 2mm
A: 2.25mm
E (that’s where it begins to buzz), I have to raise the string to 2.75 to get rid of most of buzz (but not completely)
And the real problem, the B string: it’s already at 3mm and it buzz like crazy on frets 3 to…well till the end of the neck but especially on fret 6, 7, 8, 9.
The buzz actually happens when I let the string ring out. If I play really short notes, there is no buzz.

I really don’t know what to do since, to me, the action is already high and it doesn’t seem to go away even if I raise the B string higher.

Can you give me some advices?

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