|My response to this same question in your other thread was, "why not just disable the windows firewall?"|
I highly doubt windows firewall is capable of being set to do anything on the basis of a subnet. It's designed to protect the computer it's running on after all and not a network segment. To be honest though, I have no clue if it can as I would never rely on the windows firewall to protect anything and have therefore never touched it.
You're using SOHO routers with firewalls built into them to separate your subnets. Why would you also need a firewall on a client that's already behind a firewall?
In the computer world we follow the KISS principle whenever humanly possible. Never heard of that one?
KISS = Keep It Simple Stupid
You're overcomplicating your network and if you continue, when something breaks (not if....when) troubleshooting it will be an absolute nightmare.