What you have there would have worked; you just needed to check the "Use different follow master" option in the Jamba-Follow options and push the settings to all toons.

The command /jamba-follow setmaster is for this seperate follow master. Otherwise, you need to change the actual master and issue a follow command.

Hope that helps and you get it working (with with Jamba or ISBoxer). Please let me know if I can make improvements to Jamba to help you with this as well.