ASUS RT-AX3000 Slow Ethernet Speeds w/ Cat 7

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First time setting up home network with separate modem and router.  Cannot seem to get the speeds I'm paying for out from the router.

• Nothing has been customized (i.e. IP addresses, subnet masks, etc.)
• Everything up to the DOCSIS 3.1 router is receiving Gigabit Service successfully
• Receiving ~250Mbps down when should be 700 - 1000Mbps down
• I have tried Cat 7 and Cat 5e cables with the same results
• I have troubleshot the issue on both the most recent firmware and the factory version firmware; no success
• PC has Intel Gigabit Ethernet port
• I tried with and without AiProtection, Adaptive QoS enabled; no success
• I don't use AiCloud 2.0, USB app, or Traffic Analyzer
• Guest Network and IPv6 is disabled

I've spent the last four hours troubleshooting this searching for anything and have found nothing in regards to the RT-AX3000 regarding degraded speeds.

My brain is absolutely fried and any help would be greatly and gratefully appreciated!