GL-MV1000 "BRUME" speed problem

Im having same issue with my GLMV1000W, got a new ISP router (1gb) and i get around 450mb download speed on latest snapshot (4.32) and latest stable (3.216). Testing using router connected only to a PC with ad guard and realtime statistics disabled

Tried using my b1300 but this could only achieve around 400mb to.

My flint AX1800 is the only one that can max out the connection at 940mb.

I was using the Brume to cascade my routers but its now throttling my connection to Flint. Anyway
I can get this to passthrough at full speed please?