...wouldnt feathering the props reduce drag and while in full fine be creating more drag???
Generally not, with PT6 powered airplanes, in my experience.
Remember that even in fine pitch, the propeller still provides forward thrust.
However, the idea of feathering more than likely has to do with fuel consumption rather than anything else.
Using beta for taxying is generally a better idea and in addition, it provides a method whereby the engine is properly cooled (IE: stabilized temperatures) prior to complete shutdown.