[Nighthawk M1] B40 2300MHz and B7 2600MHz signal cannot be improved by external antenna

Don't know why there is still no feedback or reply.

I did more testing.

Only one external antenna to left port, right port; And two external antennas to two ports and then swap two ports.

The device is M1 Telstra.
Didn't use band forcing lock, use the system default "Auto" band option.
These outputs were got after the external antenna was plugged in. I didn't do any speedtest in this whole test.

Below is the output of command AT!GSTATUS?
Only one external antenna, left port
AT!GSTATUS?
!GSTATUS:
Current Time: 586 Mode: ONLINE
System mode: LTE PS state: Attached
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC:
LTE band: B28
LTE bw: 10 MHz
LTE Rx chan: 9260
RSSI (dBm): -43.3
RSRP (dBm): -72.0
RSRQ (dB): -13.0
RSSNR (dB): 9
Tx Power (dBm):
LTE Cell ID: 23115059
Physical Cell ID: 278
TAC: 57501

SCC1:
LTE band: B7
LTE bw: 20 MHz
LTE Rx chan: 3350
RSSI (dBm): -100.8
RSRP (dBm): -127.3
RSRQ (dB): -18.8
Physical Cell ID: 41

SCC2:
LTE band: B3
LTE bw: 15 MHz
LTE Rx chan: 1725
RSSI (dBm): -59.4
RSRP (dBm): -80.3
RSRQ (dB): -13.2
Physical Cell ID: 161

One external antenna to right port
!GSTATUS:
Current Time: 909 Mode: ONLINE
System mode: LTE PS state: Attached
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC:
LTE band: B28
LTE bw: 10 MHz
LTE Rx chan: 9260
RSSI (dBm): -45.0
RSRP (dBm): -71.3
RSRQ (dB): -10.3
RSSNR (dB): 6
Tx Power (dBm):
LTE Cell ID: 23115059
Physical Cell ID: 278
TAC: 57501

SCC1:
LTE band: B7
LTE bw: 20 MHz
LTE Rx chan: 3350
RSSI (dBm): -92.6
RSRP (dBm): -129.7
RSRQ (dB): -16.7
Physical Cell ID: 41

SCC2:
LTE band: B3
LTE bw: 15 MHz
LTE Rx chan: 1725
RSSI (dBm): -50.4
RSRP (dBm): -78.8
RSRQ (dB): -9.7
Physical Cell ID: 161

Two external antennas -> two ports
!GSTATUS:
Current Time: 1076 Mode: ONLINE
System mode: LTE PS state: Attached
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC:
LTE band: B28
LTE bw: 10 MHz
LTE Rx chan: 9260
RSSI (dBm): -42.7
RSRP (dBm): -71.4
RSRQ (dB): -9.8
RSSNR (dB): 3
Tx Power (dBm):
LTE Cell ID: 23115059
Physical Cell ID: 278
TAC: 57501

SCC1:
LTE band: B7
LTE bw: 20 MHz
LTE Rx chan: 3350
RSSI (dBm): -92.5
RSRP (dBm): -129.0
RSRQ (dB): -16.5
Physical Cell ID: 41

SCC2:
LTE band: B3
LTE bw: 15 MHz
LTE Rx chan: 1725
RSSI (dBm): -50.7
RSRP (dBm): -76.9
RSRQ (dB): -7.5
Physical Cell ID: 161

Two external antennas -> two ports (Swap)
!GSTATUS:
Current Time: 1193 Mode: ONLINE
System mode: LTE PS state: Attached
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC:
LTE band: B28
LTE bw: 10 MHz
LTE Rx chan: 9260
RSSI (dBm): -44.4
RSRP (dBm): -72.1
RSRQ (dB): -10.8
RSSNR (dB): 8
Tx Power (dBm):
LTE Cell ID: 23115059
Physical Cell ID: 278
TAC: 57501

SCC1:
LTE band: B7
LTE bw: 20 MHz
LTE Rx chan: 3350
RSSI (dBm): -85.9
RSRP (dBm): -120.5
RSRQ (dB): -14.6
Physical Cell ID: 41

SCC2:
LTE band: B3
LTE bw: 15 MHz
LTE Rx chan: 1725
RSSI (dBm): -49.7
RSRP (dBm): -77.1
RSRQ (dB): -8.7
Physical Cell ID: 161