My flights with the use of the centre tank with 9.000+ a very rare. So far, I don't recall engine problems when using the charted setup you've posted. But I can check it again later and will post the results.
[edit]Works fine, means as charted.[/edit]
Can you confirm that your other tanks are full? The centre tank is the last one to be filled. For a quick look, click here. That's some older rw doc.
http://imageshack.us/a/img5/7440/fueltd.th.jpgLoad the sim plane from the outer to the inner tanks and you should be fine. Drain from the inner to the outer ones then.
I think those always on low pressure lights are a special of that old system setup. If my memory doesn't trick me, Lou mentioned that the FE had some caps to put on certain lights.
Same for the 727.Keep on going on the fuel planner. Your concept looks very nice and will be most welcome I think. :)