I hope your search has been fruitful. I also have a connection to the Couamin family in Leogane (Bigone).One of my ancestors's branches come from Impair Couamin and Sulette Délices Constant. Their daughter Marie-Rose Percide Impair Couamin is my great grandmother and "Mantoute" or Marie-Claire Impair Couamin is my great great grandmother. I also live in Canada (Ottawa) and I am helping to build on what the elders left as traces of our tree. Would be glad to exchange with you.
I am seeking info on the following surnames:
Saint-Vil, Delices, Constant, Saint-Polin, Impair, Couamin (especially the branches connected to Leogane - Bigoné, Cormiers etc...)
Volcy, Francisco (especially as connected to Port-de-Paix)