Archer A7 (AC1750) Slow Ethernet Connection to PC
I just upgraded my internet from 100/10Mbps to 400/20Mbps. I've connected my PC to the modem directly and I can get 400+Mbps consistently, which is great. However, when I route the ethernet connection through my A7 router I'm down to about 130Mbps on a wired connection. 5GHz WiFi is about 100Mbps, which seems ok for WiFi relative to 130Mbps on ethernet, but both should be much higher. Ethernet should be around 400Mbps and I'm guessing the 5GHz WiFi should be around 250-350Mbps, depending on how far I am from the router.
I found this thread and tried the steps there--disabling NAT boost, then disabling NAT boost and setting Duplex to Full 1000Mbps--but those changes didn't help. All of my ethernet cables are cat7, so I doubt they're the problem. I've also tried rebooting the router and modem of course.
Any ideas for what I need to do to get my full internet speed through the router?