Prop size for twin D F150's

[jd71609]

I have a 2005 Sailfish 2660 that I just purchased the boat had 2010 twin DF150's with 2 hours on them. The props were Solas 14x19. They are turning 5700 rpms at about 34 mph and hitting the rev limiter at about 38-39mph.
I have been told a 15x21 a 16x20 or a 16x23 any suggestions on props? I'm new to the site and appreciate any help. Thanks

[Talklessridemore]

Think about this..
When u go fishing ,, how many friends are going ?how heavy they are ?
How much fuel ?
Ice chest ?fishing gears ? Load up ur boat
Then run the motor with 14x19 prop, if you hit rev limiter.
Your prop is too small, go with 21- if ur wot is 5,400 or less - go with
17 pitch. But before you do this test, make sure that ur throttle body
Opens up all the way @ wot
I found that 6 or 7 out of 10 , throttle cable needed to be re adjusted
I usally set it around 5,800-5,900 @ wot
By the way, i really like suzuki 115 and 150 more than V6 (DF 200-225-250)