Wet tumbling involves "WATER" and not everyone has the same "TYPE" water, you have water hardness to deal with, minerals in the water and water treated by municipalities and what they add to it. I have well water and a water softener and my results will be different than the water you have. What T-REX brought up is like a bunch of women getting together and talking about what gets the grass stains out of their kids cloths.
On a washing machine on the regular cycle "YOU" get to set the time the washing machine runs to get the laundry clean and YOU get to pick the laundry detergent. And my next door neighbor on city water sets their wash cycle time differently and does not use the same detergent.
Its YOUR water and YOUR brass and you have to find out what works best for YOU and not someone thousands of miles away.
Its your brass, clean it the way you like, and the way that makes you happy. All these posts with recipes for cleaning brass are worthless, if my water softener runs out of salt MY tumbling time changes. So who cares and what is so hard about follow directions.
On top of this not everyone has the same type pins sold by the cheapest vendor in China, sharp ends, dull ends, different diameters, different lengths................
and on top of this you wash your cloths until the grass stains come out, end of story.
Below Chinese pins and uniformed flash holes.