Add routes to the gw or the returning TCP traffic won't know which way to return, and it has to come back the same way.
Traceroute from PC and pfSense to each other, note the return route via gw.
You might be able to ping, but telnet x.x.x.x xx won't work.
Route the whole subnet, and control the hosts with firewall rules, mask mismatched?
add route 10.71.9.0 mask 255.255.255.0 192.168.1.80
No NAT between OPT1 and LAN