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I agree and I disagree. I know in this case it could be considered "low priority" but in all reality, this is the snippet you want showing when someone searches for your keyword, so it really should be optimized with the rest of the meta data, all at one time. Changing bits and pieces isn't the most efficient way to get it done. It is more likely to see a change in rankings when the on page optimization is all completed correctly at one time. Use the on page grader tool here to double check each page individually. It will give you a list of the things you need to change to best optimize a page for a particular key term.