Windows 7 services not recognizing environment variable changes

I have 200+ Windows 7 machines that are part of a render farm. They're all running a service that is responsible for running render farm commands on the machine.

Currently, several environment variables are set via Group Policy.

After changing environment variables in the Group Policy and restarting the machines several times (by issuing a remote command through the service), the environment variables still aren't being applied to the service.

However, if I Remote Desktop into the machines and then restart, the environment variables will be applied correctly to the service upon restart.

Is there a way for me to get these environment variables to apply correctly to services without having to Remote Desktop into 200+ machines every time I change an environment variable via Group Policy?