It may be the Countryman doesn't need much tuning. I've spent a few hours messing with the settings and tried a few other Mini tunes on it (including VTiRoj's) but haven't found anything to improve on a very basic and simple setting.
I suggest you find the Tuner Wars thread and set them a challenge to tune the best Countryman for your TOCA series, it could get you three or four tunes to choose from.