I wet tumble, too - that's why the cases in that photo don't have any of the poly coating on them.
The only thing I do differently than with brass is I don't do a clean-water-rinse after the rumble, and I blow the cases dry with an air compressor. I don't have an explanation as to why this works, but it does -- something about keeping the soapy water residue on the cases keeps them from rusting. If you do a clean water rinse and don't do something else to the cases (like vibrating tumbler with car wax), they'll rust within days (and sometimes even overnight depending on the humidity).
I also do not re-tumble after sizing to remove the case lube; I just wipe the cases clean lightly with a rag.
I have steel stuff I've reloaded that has been sitting in the safe for over 18 months and hasn't developed any rust yet.



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