RK,
Welcome to the CDR club! You can get a different seating stem that has a cup shaped for the semi-wadcutter so that they won't get jammed in the seater.
You can get a different sized stem for your die that will take the small decapping pin.
Brass cases are easier to resize as they are softer than the nickel plating.
As you can see, reloading is a bottomless bucket that consumes "Luger money"!
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