Most motors have some 'fat' built into their ratings so providing you have decent cooling I'd not worry if you are on the stated limit. Also bear in mind that you probably measured watts and amps with a fresh battery, after a few seconds the power drops off as the battery loses it's initial surge of power, then it unloads again in flight.
Some of my motors are running well over their factory stated maximum power when measured static but I've never yet burned a motor and with good cooling they don't even get unduly hot. Efficiency does go down the pan a bit when you work the motor very hard but unless you are running flat out all the time that's not really an issue.
Steve
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