RT-AC68U Ping Spikes and Buffer Bloat

Router:
Asus RT-AC68U Revision C1

Firmware:
Asuswrt-Merlin 384.6

Bridge:
Linksys E4200

ISP:
WISP with
50 Mbps Down
15 Mbps Up

Modem:
Ubiquiti POE
POE-24-12W-G-WH
https://www.wifi-stock.com/details/...-poe-adapters-white-5-pack-poe-24-12w-5p.html

Setup:
POE (Modem) -> Asus AC68U (Router) -> Linksys E4200 (Bridge)

Issue:
I will be on a 5 GHz Channel that only I use, and another user will be on the 2.4 GHz Channel. If any other user starts to use...

RT-AC68U Ping Spikes and Buffer Bloat