The drawback of wet tumbling is peening the necks. Eventually with enough wet tumbling or extended wet tumbling sessions the burs or peened out brass will turn into excess. As you size the brass with peened necks, the button and bushing will smash the the deformed neck material back in. It won't protrude as a bur anymore, but it doesn't go away. It collects at the case mouth. Eventually your case mouths will be thicker than the rest of your necks. You'll notice it when you try to slide a bullet into a fired case and there's resistance. You're effectively creating "mouth donuts". It appears like you have a tight neck chamber or your necks are too thick. Eventually you'll figure out the mouths are thick.
You can mitigate this by wet tumbling for shorter sessions, ommiting the pins or SS media, and trimming using a tri-cutter AFTER wet tumbling to clean up the micro-deformed (peened) case mouths and not allowing excess brass to build up from peening/ sizing. By trimming before wet tumbling, you're just beating up that nice sharp, clean case mouth you created.
I would recommend wet tumbling nasty brass for 20 minutes without pins. Drying. Lube. Resizing/ depriming. Dry media tumbling to remove lube. Trimming (chamfer/ Debur). Prime. Load.