help achieving actual isp download speeds (wifi)

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If you are subscribed to a 1200mbit download plan, then avoid using the QOS function on the router,as it will be rare to saturate the connection.

For WiFi performance, it is an 802.11ac router, and if using a common 2 stream 802.11ac WiFi adapter, then the max PHY rate you will usually get, is a PHY rate of 866.7 Mbps , which translates to a real world throughput of around 550-650Mbps under nvery good condition (close to the router in the same room).

If you want a WiFi connection that can take full advantage of gigabit internet speeds, then youneed to use 802.11ax with a card such as the Intel AX200, which on a 2 stream connection to an 802.11ac access point, can reliably do 1600-1700 Mbps real world speeds from the 2400Mbps PHY rate. But better than that, even 30-40ft away, they can still sustain over 1000Mbps.

Outside of that, you will need to use a wired connection in order to enjoy the full throughput of your connection.

The QOS in the R8000, impacts the WAN port, by prioritizing different tiers of traffic, but if you have a single gigabit WAN port, and your ISP overprovisions to 1200Mbps, then you will never reach a point where you can saturate the WAN connection, thus QOS will not really benefit you in terms of ping times (though it can help in terms of ensuring that a ton of bulk traffic such as downloading a steam library will not cause a netflix stream to fail).

PS, if your ISP is truly giving over 1Gbps, then to enjoy the full speed, you will need a router that offers port teaming / LACP to get an effective 2Gbps connection between itself and the mobem.