That the key to most things air gun . It's the what you find that works best for you .. lol
Thing about tumbling is it helps knock off the scarfing/ lead shavings and smoothes out the casting marks if any . Also I like to keep my lube rag clean .. I figure if I got lead shavings or flakes on my lube rag I failed to tumble wash, tumble rince, tumble dry proper. / Poor job .
Once I get my lune rag " primed" with the just right amount of lube I reuse it over and over just keeping a fresh spot of lube on the rag and keep it in its own container.
I also use auto trans fluid as my lube . ( Type f I think )
But anyway everybody got there thing and ways .. it's whatever you feel gives you the edge..