Wireless Joint

First, thanks for the really detailed test report in the initial post, you're definitely on the way to mobile router geekdom. xD
Second, I've noticed you wrote "64 worked the best for both TTL or HL, others (63, 65, 117) reverted back to throttled speed", but then later wrote:
ip6tables -t mangle ...

Current configuration:
WE1326V5- GO2019-04-09, MC7455- Generic Version 02.33.03.00, QMI Mode, IPV6 disabled on modem, Verizon post paid unlimited tablet plan.

I have been fighting hotspot usage since first receiving the equipment in July. Some data would count towards hotspot while other would not ...

What's the difference in using AT+CFUN=0;+CFUN=1,1 versus AT!RESET to reset the modem? I see the steps above to use RESET and comment out CFUN, but /usr/lib/custom/johns_ping.sh on my WE1326 GoldenOrb_2019-04-09 has AT!RESET commented out and uses the CFUN command to reset the modem.
My modem will ...

WE1326 (GoldenOrb 2019-03-10)/MC7455 (shipped Generic version), QMI mode.

Since the initial build, the router has been re-flashed and modem reset. Setup used with Verizon postpaid 15GB hotspot sim and Straight Talk Prepaid sim with no problems.

Trying to test with GoUnlimted cell sim from Pixel ...

There is a picture of the main board on wikidevi.com that labels the LEDs as PWR-5.8G-2.4G-WAN-LAN4-LAN3-LAN2-LAN1. The picture appears to be Version 00, so not sure how the V5 would differ. On the WE1326 that I have, the three from the left are on always on.

I recently received the WE1326V5/MC7455 router/modem and wanted to upgrade it to use the 698-2690MHz Cisco 4G LTE Antennas And Extension Base. Since the WE1326 has internal LTE antennas the case must be modified to install the TNC pigtail connectors. In stock condition, it has 2) RP-SMA and 2) SMA ...