Another way to look at it is you are 900 rpm away...with my 14x19 I spun right at 6200 at WOT 40mph GPS measurted, the 14x21 was around 5900 WOT, 38 or so mph.
You will be much happier with one of those props at all rpms, your boat will pop out of the water when you take off, and I bet you cut your fuel usage by 1/3 or more.
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Stay Safe!
Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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