May i know what are the bands used by huawei device , have you tried to keep the same bands manually on TRB device.
Might be LTE band that is automatically choosen by TRB has lets suppose -55dbm but less bandwidth and may be LTE band choosen by huawei has -64rssi and higher bandwidth.
Further the 150mbps bandwidth is basically in lab conditions. Have you tried with another LTE CAT4 device , what are the results on that?
Please let me know.