[c3700] NAT issues connecting to PlayStation 4

Here's how I have the set up.

C3700 modem/router is in my basement
Lan1 port - connected to PS4 (25' cat6 cable)
Lan2 port - connect to belkin router upstairs (25' cat6 cable)

Been trying for a few day not and don't understand my issue...

I have a c3700, I have my PS4 connected to LAN1 (cat6 cable). When I "test connection" on my PlayStation I get NAT type 3, strict.. can't play with any of my buddies online.

I opened ALL ports recommended for all the call of duties and PlayStation network.

Still get a NAT 3, strict with a WIRED connection.

Using Wi-Fi, I have all ports up etc, gave my PS4 a "address reservation". When I test connection on my PS4 I get a NAT type 2 but at the multiplayer "menu" I get NAT:strict

I question here is can I turned my c3700 Wi-Fi off and use it only as a modem and be able to use BOTH 1&2 LAN PORTS to get access to my PS4 and router or no?