It all becomes easy the second and third time you do them.
Those innovate wide bands can't be beat for dollar verses performance. Just bought two myself, the inbuilt controller and E85 compliant were what sold me. FYI they read every bit as fast as the $400-700(AUS made)Tech edge ones.
I would have done the ignition map the same as your first one. Every setup/tune I've seen done or done myself has started with initial base timing, then done the advance curve. But hey, what ever works I spose.
Good to see your getting your head around it, there is a chance I'll have to do one of these things soon, so this thread will help with those why can't I get it right moments! You may end up getting the "so why is this msd thing doing this?" Phone calls. Haha.