Hi Shneck,
The metal taste should only linger for the first ml or so, normally caused by Not tempering the Kanthal or the Nichrome.
Some say NiChrome has a longer lasting metallic taste than Kanthal; others say it's the opposite; some are just more sensitive to it and can taste it all the time.
You don't mention the type of RTA you have so it would be difficult to guide you to the relevant Tutorials. You don't mention the Tut you have followed.
The types of SS you have are really for the type of Juice you use, VG 325, PG 400, I know some use 316 I haven't tried it, I have 200 also (freebie by the Wonderful Folk at The Mesh Company) I haven't tried it either, I have a SS wick in one of CE4's and it works well enough, just makes for a Hot vape.
Let us know what you have, to get best advice.
