. . . Additionally, I don't use canister lights - as my dives just don't require these...
If you are taking Fundies in recreational gear configuration, lights are not required. To earn a Tech Pass, yes, then you need to have a primary light.
Are there any books apart from the original "DIR" to read re setups etc on the subj?
The gear configuration information on GUE's web site and other "DIR" web sites is all you really need. Sure, there are books, like Doing It Right (which everyone agrees is a bit dated), and Dress For Success. I see that the PDF of Doing It Right is now included with the Fundies course materials you get when you register for the course.