Nancy, Sophronitis (Laelia) sincorana is an interesting plant. It fits nicely into the Hadrolaelia (thick leaf) category of the genus. It also acts and looks like a rupiculous (rock ) Laelia (most of which are Hadrolaelias). Interestingly, Withner points out these things and proceeds to say it is not a Hadrolaelia or a rupiculous Laelia. What was that duck story?
The web site
How to Grow Rupicolous Laelias gives some excellent media advice for these plants. Even more than the C. aclandiae we were discussing, this plant wants to be wetted and dry quickly. Both C aclandiae and S sincorana come from Bahia although sincorana seems to be further inland and drier.
We do not own sincorana, but we grow several Catts and Laelias on rock as shown in the web site above. I'm convinced that those in rock are the best growers we have. I can recommend that method. You can either pot it in rock in a clay pot or put it in a plastic or wooden basket with rock (use plastic gutter guard to line the basket and hold the rock in). A plastic basket has the advantage of not rotting. Since the media never rots there is no reason ever to repot. You just put the old pot and all into a larger basket with additional rock. You can hang the basket if you wish to keep air roots from laying on bench tops. We water plants in this type media about every 4-5 days in the growing season and about once per week in the winter. At least in the GH, watering schedules must take into account recent temperatures and humidities. A strict rule of thumb is not really useful.
Good luck with your sincorana.