After playing around with it - I discovered that I needed to move to Manual outbound NAT - I didn't realize that when Automatic NAT is turned on that it ignores all the rules that are set.
By adding some rules to allow outbound traffic on the main LAN and the OPT lan - that I can have my main LAN NAT to the interface address and then allow OPT's lan to NAT to the static IP of .131.
Now I can do this with the few others that need to have it done.
Thanks!