Good idea to make a simple setup first.
There are no TCP option 76 tags in the TCPdump and therefore optimization is not going to work until that has been resolved:
1) Check that lan0 connects to the LAN side. In other words lan0 connects to the server on the HQ side. lan0 on the branch side connects to the workstation. Both wan0 connects to the network in between them, normally the routers/firewalls. Use the MAC address to determine that it is correct.
2) If running v.4.1.3, make sure the status says licensed and not "Unlicensed - Bypass". If bypass, send the tokens to support at wanos
3) Check the traffic policies to ensure that traffic is not bypassed with a bypass rule.
Think about it, after installing the images, all that is needed is to connect the wan0 interfaces together and start generating non-bypassed TCP traffic. If running >=4.1.3, then load a key as well.