Your catasetums may surprise you, since they are coming from south of the equator. They may not be dormant. If that is the case, you will probably want to water and fertilize until the pseudobulbs reach maturity, so that when they finally go dormant, they will have the resources to make strong new bulbs.
Have you read the material at
Sunset Valley Orchids - Superior Hybrids for Orchid Enthusiasts ?
Fred Clarke has all the information you need to successfully grow catasetums.