Kupplugsbasic setting Müller Power Clutch

Hi together, I built in a Müller Power Clutch with my dyna, everything went smoothly. After that I made a basic adjustment, as described. The clutch separates clean and does not slip. As it should be. Unfortunately, the clutch comes very late. Now I think about changing the basic adjustment so that the clutch comes earlier. I always have to check if the clutch separates still cleanly. Therefore the question: I have to screw the clutch cover every time n, before I test whether the coupling is still properly separated. Or can I leave it open without the oil coming in. Of course, I do not do all this while driving, but vertically mounted. TIA