Well, closer inspection with a magnifier and pen light reveals some damage to the primary jet emulsion tubes - perhaps I made it worse by trying, but I was rather easy on them since I'm so paranoid. That and some nasty looking gasket goo (Hylomar?) in some areas of the bowl flange - looks like a PO tried to 'seal' the bowl gaskets with the stuff - not good. Anyway, I'm pretty sure at this point there's no turning back and these will need to go all the way (surprise!

- DUH!).
Anyway, as suggested, I'll quit while I'm ahead (??) and start the vinegar soak today, and go from there.
Again, thanks for the help guys, this info is priceless!
POWDER COLORS: I have a lot of colors and textures including multi stage candies (but of course, their tricky - still getting used to the process).
Many colors are high gloss but high gloss clear can usually be added (not needed though > aside from sheen, it only adds film thickness).
I will did up my sample ring and take some pics - may want to send to private email for best image quality - you decide.