...We are both ASA Basic Keelboat (101), Coatal Cruising (103), and Bareboat (104) certified. I went on to earn my ASA Navigation (105) certification as well. We have done 4 crewed charters, 3 in the BVI and 1 in the Florida keys.
Certs are good, but have you actually done any sailing charters with any kind of similar boat where you have been fully in charge?
By that I mean, rent and provision a 30-40 foot boat, brief the crew, do all the checkout stuff, nav the routes, sail it around, deligate roles, dock/anchor/moor it, manage the battery state, deal with the heads etc, then clean and return ir?
If not, that is what the charter company is cautious about. Certs are good, and they demonstrate academic knowledge and seriousness, but experience counts too. Frankly, classes are easy becuase being on a boat with a bunch of other students and instuctors all working hard and demonstraiting skills is very different than sailing with friends and family on your own.
If your resume doent show experience, that is the problem.