It would be a good idea to rethink your dates. You should not be sailing in the
South Pacific in either February or March. By all means leave Panama at that time but don't go past
Marquesas before 1 May. ARC arrive there in early April.
There was a huge cyclone in
Australia just a few weeks ago. In recent years there have also been major cyclones in
Vanuatu March 2015 and
Fiji February 2016. You don't want to see your pride and joy turned into toothpicks.
At the other end you want to get yourself into
New Zealand or
Australia before 1 December.
. . . . and while I'm here, you won't be averaging 8 knots. It will be less.