I think the tut is now outdated. I think IBLs are now becoming outdated though some may use them as cheap fill lights in certain situations. AO is outdated now that 2012 produces pretty nice IDL. Now you get contact shadows AND bounced light from contact surface.

I would let go of your old lightsets and start fresh. What you need most is a sphere to park a world image on. Be it sky or the inside of a cathedral, this replaces the ibl and provides light on its own.

You can then add one mainlight for sun (start with infinite)or spot. A specular only light to help with spec of couse. Start simple and work your way up.

Preview does kinda suck but you can add a worklight for posing and just tick it off before rendering.