Smart connect with RAX75 router and AC2100 Genie as an AP

I'm new to the community and need some help.

upgraded to Nighthawk AX8 enabled WIFI with smart connect & Beamforming enabled.   

Poor coverage in lower part of the home.

Configured Genie AC2100 as an AP with those same features enabled. Also using and same SSID and Password

It is installed in tha area of weak coverage with a WAN (on Genie)  to LANport #2 ( on Nighthawk) Ethernet Cable between them.

Both device are visable on the LAN . When I check attached devices I find some Wireless devices connected to the Nighthawk when the Genie should be closer and visa versa. 

Am I using the right features so that the best wireless frequency and strongest signal deternine which device I am connected to?

Is there a way that a device moving through the home will transfer from the router to the AP and back again when the signal is reduced?