I would stay away from the Fair Wind sailing school!

While they offer good practical experience, they do not offer a recognised certification. Plus the owner is a mess, treats his captains like crap and there is no guarantee that there will be anyone to offer you training when you get there. I am speaking from personal experience having taken the fair wind training course in the BVI in 2015.

Sounds like you want to pursue an ASA certification from which you can build on. Stick to ASA certified schools would be my suggestion.