When you are done cleaning the "bread slicer" there only should be metal and air, with some grease ONLY on the shaft at the bearings. The grease on a FIN changes the dielectric constant of the air - metal of the capacitor, so a SPOT on the fin could be causing the detuning you are seeing on the second station. PLUS you NEED to give the "bread slicer" capacitor 24 hours to dry out of the zero residue cleaner befor evaluating or changing settings. ONE OTHER thing to remember, the "bread slicer" capacitor gangs that have many many fins are for AM!! The FM gangs are between the AM gangs and have far fewer plates.