Perhaps the level of 'spin' should depend on the reporter covering the article?
If you have dedicated 'reporters' covering certain parts of space - the name alone could give readers an indication or potential bias.
Reporters could also include quotes from parties involved that show their own personal biases - or allow aggrieved parties to offer 'corrections' and counter-spin via a 'letter to the editor' (which often happens IRL).
Letters are often part of an 'Opinion' page - also covering Editorial Comment and Opinion pieces from various factions.
How much spin you put on articles also depends on the over approach of the media. Is this News Service a reputable journal or a sleazy tabloid?
And more importantly - can we have both! We also need a sleazy tabloid/conspiracy nutter webzine!