Why are you spaying anything at all in the measure? There is no need for anything to be sprayed on, or in it.
Where did you spray the PB stuff? In the hopper or on the mechanical linkage part?? Powder itself has enough "graphite" in it to lube a season any powder measure.
Clean it off. Use rubbing alcohol and a rag,
If you have to use a Brake Cleaner use the RED chlorinated kind, not the GREEN NON chlorinated as it is flammable and contains acetone which will eat up plastic. (even though most LEE stuff is Nylon) Use it OUTSIDE or well vented area. Wear eye protection, you do not want it splashed back in your eyes! (don't ask how I know this)
Going back to the beginning if the powder adjustment screw is IN to far it will jam the rotor. It has to be backed out enough to clear.