Ok.. no need to stress the charlie out

RTFF... as opposed to Tortola Fast ferry could be a source of confusion.

RTFF typically does not stop in WE.. it goes direct
RTFF typically does not have island style issues

Stuff happens... not sayin' it cant...but this is the better of all the ferries (my opinion only)

the 10am will be fine for a 2:30 flight (get a porter if everything goes wrong and you cut it too close for comfort)
the 10am is NOT fine for anything before 1:30 flights.. and even that is cutting it close

if you are truly uneasy... take the 7am RTFF from Town
Because.. if it fails to run - grab a taxi to WestEnd and catch Native Son at 10-ish... they won't all die the same day.
end of problem... and as RonP said... enjoy a morning in C-Amalie

After all these years... the day that RTFF screws me up... will be the day I change my tune... but until then.... see my comments above