I have found that Fritzing does not deal well with individual parts that have tight spacing when checking with the the DRC tool. It almost seems that it ignores the settings and uses the default spacing when checking between pads on a single footprint. All I have done is made sure it looked exactly as I intended before sending them off to have manufactured.
What you will find when you get the boards back from your manufacturer is that the spacing is so tight that you will not get any solder resist between the pads but otherwise they will be exactly what you have designed.