As for my own personal experience with XDCAM HD, always use the Easy Setup that matches your footage.
Its easier and better to work with XDCAM HD than HDV, but keep in mind, even though XDCAM HD 25 mb/s is similar to HDV and uses the same codec concepts, its still different. XDCAM HD and HDV are two different formats that share the same conceptual components.
Which btirate are you using? Are you using the Sony Transfer software?