The reason I gave my answer in a sort of smart ass way, was that your question implied that you didn't understand lie angle, i.e. you hadn't done the work. Sounds like you have done some. I would think center of sole contact is a basic golf design truism, and not junk. The best way to measure and adjust is, of course, open to debate.
If you hit club #1 making a mark on the toe, and you then hit a club that is 4 degrees more upright also on the toe, then 4 degrees up is not enough upright for your current swing.
I love the explanation in the previous post. I have done the lie board thing more than a few times. I can adjust to a different lie angle in a few swings after seeing where the marks are located. Actually, making swings on grass, and analyzing divots, is in my opinion a better approach.
I'm not saying you should do the analysis yourself. I thought I had my lie angles pretty much right on at 2 up. That's what I have used for years and years. During my lesson with Brian, at some point, he looked briefly at my 6 iron divots, and told me to go more upright. "How much more", said I. He replied, "At least 2 more, maybe even more than that. Enough to get those divots level." Then I asked about making the wedges a little flatter lie angle.
He said something like, "Why would you do that?"