I have a WG tunnel active between remote Deco x55 units.

server is 10.6.6.1 on 192.168.30.1/24

client is 10.6.6.2 on 192.168.68.1/24

server allow ip 10.6.6.2/32 (0000 for peer)

client allow ip 0.0.0.0/0 dns 10.6.6.1,8.8.8.8 (dont need super private)

through deco app I have one allow device on client side (192.168.68.103) but it does not seem to be forced to use the tunnel.

i only have various traffic meters so not too accurate but i thought it was using the tunnel for an hour but then I think it went back to local gateway. 
do I just add default gateway to that client device as 10.6.6.1 or 10.6.6.2? I don't think you can static route by ip source and I don't see any new system routes after adding tunnel. 
should it be using the tunnel for all traffic by config alone?