Need help with RP-AC68U speeds

Hi all,

I am trying to figure out why my new ASUS RP-AC68U seems to be getting slow speed through its Ethernet ports. Here is my setup:

Internet: Neatgear DOCSIS 3.1 Cable Modem with Comcast Gigabit service (direct speed test ~980 mb/s)

Router: ASUS RT-AC88U
Repeater: ASUS RP-AC68U (repeater mode)

Here is the speed test I set up:

1) iPhone 7 plus connected to repeater via 5ghz wifi: getting around 150 mbps

2) AppleTV connected via CAT6 Ethernet cable to Repeater: getting around 90...

Need help with RP-AC68U speeds