Well I think that the author failed to realize, that in Venice it's recommended at high tide.

Back to the task at hand;
The whole idea of having a tripple is to have a wider range of gears. Now my opinion would be that if you want it to not rub, and to use the whole rear cassette, go to nine speed and loose the front derailleur altogether. on my commuter, I'm running a 7 speed mega range cassette with the front derailleur dummied with the limit screws as a chain watcher. No rub.