Found out the solution!, currently there are not much AX/WIFI6 clients are available in the wild. So while tinkering, here is the best possible WIFI option for AX73 and possibly fixes other...

@Foxx1412 I think whenever you were resetted your modem, the modem goes into not-bridged mode, I have an experienced before that bridged modem sometime need either custom options, or sometime custom...

I have experiencing slow download on my brand new Archer AX73 V1, my ISP 250/250 Mbps line is PPPoe bridged into a x86_64 OpenWRT router. Then AX73 connecting into OpenWRT router (CAT6E), tested...