The chimping was in regards to the shaping of the light, not exposure.
My L308s doesn't have the Lumidisk (bought used), so I didn't use it. I'm trying to find a decently priced Lumidisk. Went with the basics to started with ISO 100, 1/200, f/11. Things came out decent. If my subject had been more receptive, I would have experimented with distances and angles.
I've watched much of Jay P Morgan's Slanted Lens stuff, and to a large degree, find it to be more of a commercial for his sponsors. Not sure if I've picked up any new knowledge from his videos.
Mark Wallace, OTOH, has a great DVD that I borrowed from a friend last night "Studio Lighting Essentials for Portrait Photography". Between that and his stuff on AdoramaTv/youtube, I was able to pick up quite a bit, as he shows distance between lights and model.
At least I started to use it, rather then be intimidated by it (which I think was my initial problem). I'll probably go buy a mannequin to practice on, and just play around with it some more.