E3372h-607 in stick mode on Beryl AX (MT3000) not working / unreliable connection

Routers
23

Ok, understood. @kentnek above managed it but I don’t know how.

Will try your other suggestions but my main focus was getting the E3372 running in stick modem-only mode. Any other tweaks are a bonus.

Huawei E3372 not working on Beryl AX