Stringing
You should choose your string and tension with at least as much care as you choose your racquet. The “rule of thumb” is that you should re-string your racquet(s) as many times per year as you play per week (unless your strings break, of course). As your level advances, you may find advantages to stringing more often so your strings are “fresh”.
When strings go “dead,” they don’t lose power, they lose tension. This means that you have looser strings, so the ball goes farther for the same effort, with less control. You also lose control because the strings feel differently than they do when they're fresh, so you either have to adjust your game, or content yourself with not playing your best.
Stringing Facts
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Lower string tensions generate more power
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Higher string tensions allow for more ball control (for experienced players)
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A longer string (or string plane area) produces more power
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Decreased string density (fewer strings) generates more power
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Thinner string generates more power
More Stringing Facts
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More elastic strings generate more power
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Strings that produce more power will also absorb more shock load at impact
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Softer strings, or strings with a softer coating, tend to vibrate less
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A stiffer stringbed tends to produce more spin
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The more elastic the string, the more tension loss in the racquet after the string job