Metal in the pan, shifts good, fluid great any guesses before I pull it down?

If the aluminum is indeed coming out of the converter, then the stator is starting to fail. 99% of converters have an aluminum stator and an aluminum stator cap. The high dollar performance converters though will have(or could have as an option) a custom made steel stator and cap. I agree with AJ that most likely the aluminum/brass is coming from something inside the transmission.
Other than someone brazing, not tig welding the tips of the converter vanes, there is little brass internally in a converter. Most Chrysler converters I've seen apart, come with the pump half of the converter already furnace brazed for added strength, and I doubt that the brass material is coming from there.
As d55dave has pointed out, you can't effectively flush out a converter. It should be taken apart by a good converter shop and cleaned properly. At this time, the shop will also be able to detect any areas in the converter that require attention.