Asus RT-AC3200 Dual WAN Load Balancing + Rules + Failover

Hey guys 'n' gals,

I have an Asus RT-AC3200 router and two VDSL lines with their own modem/routers.
I want to manually assign the different VDSL Lines ( let's call them VDSL1 + VDSL2 ) to the various network devices/PCs.
I want Load Balancing with Routing tables in other words.

I have configured it as follows:

Dual WAN Mode: Load Balancing
Ratio: 1 to 9 ( want to offload most devices to the VDSL2 line and keep the VDSL1 to the "core" devices )

I have configured the routing tables ( 28...

Asus RT-AC3200 Dual WAN Load Balancing + Rules + Failover