While Firefox 26 was working fine, there remained an issue with version 25. Moving to Selenium 2.35.0 has resolved this issue. Disabled the remote-capabilities and wire tests from the remote test script until I can figure out why they are failing.
Broke out the Selenium Grid tests to run Chrome, Firefox and PhantomJS test.
There were a couple bugs in the remote tests that were preventing the remote tests from running, they have been resolved. I moved to Selenium 2.32.0, this resolved some of the issues I was seeing when running remote tests with Firefox 25.