I have a few suggestions on your load development.
Make up another 4 batches of 8 rounds each as follows:
#1 - 4.6g WST with OAL set to get just a fingernail thickness above the case (likely to be 1.215)
#2 - 4.6g WST with OAL set to 1.23
#3 - 4.8g WST with OAL set to lowest again
#4 - 4.8g WST with OAL set to 1.23
Look for signs of pressure, good function, accuracy, clean burning & least fouling in that order.
As a side note, I was interested in you bullet manufacturer and found some possible history in post #3 of the following thread, which of course should be verified.
http://www.uzitalk.com/forums/showth...mj-9mm-bullets
http://www.xtremebullets.com/category-s/1820.htm