Your data matches up pretty darned close to what I would expect. Adding weight, while increasing the mass, does not substantially alter the LOA, which is the prime variable in just how fast a boat can move through the water. Acceleration and Deceleration would be affected to a greater degree, but not the amount needed to maintain a certain speed through the water. 300lbs on a 16,000lb vessel, would be so slight (about 1 percent variation in the power required) that your data will be more susceptible to variation in measurements.
As you implied in your comparison to the 2011 data, a clean prop makes a heck of a lot more difference than a few hundred pounds of weight.
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