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The only reason cops give, at least almost all of the time, any sort of 'leeway' of ~5-10mph is to account for variation in speedometers and their own detectors. It's not because they're being nice, it's because no measuring instrument like a radar detector or your speedometer is going to be absolutely perfect. Realistically, each is likely to be be 2-3% inaccurate. So they give you the benefit of the doubt, even if your speedo was reading on the low end, and their detector was reporting on the high end, they'll never be more than a combined 5-7% off; so they tend to give you 5-10mph of room before they start issuing tickets.
So, hypothetically, you think you're doing 73mph. But your speedometer is, let's say, 3% off -- so you're really doing about 75mph. Your tire size is different than OEM, so it'll have you reading slower than actual by 2% -- so now you're at about 77mph actual, even while your speedo says 73mph. Now the cops radar is off by a couple percentage and he clocks you at about 80mph. WAY over the limit on a 63mph road.
Anytime you push the upper limit of what they "usually" have decided to "allow" you to go, you are gambling. Because, once you're riding right on the cusp you have very little margin of error to play with.
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