Home built wood boat - acceleration - 1964 Mercury 1000

Early morning run around Lake Crescent, WA. This is acceleration from 42 mph to 58 mph. I should have started with the engine trimmed up further at the start, had to trim engine more starting at the 38 min mark to get top speed.
15' Home made mahogany runabout
1964 Mercury 1000
24" small eared chopper prop
5400rpm