Many thanks for that info, 350 - since I just placed an order with Lightning Vapes yesterday for Ni200, that is exactly what I intend to do when I get my nickel wire. Can I ask how long each of the 5 dry firings were? Although I guess firing any coil while dry is indeed technically dry-firing, with TP engaged the coil shouldn't get any hotter than if it weren't dry, so it would appear you've figured out how to get the best of both worlds - clean the coil, without causing any damage to the metal or the off-gassing of undesirable compounds that might happen at higher temps.
Since you have now calibrated your taste buds to the flavor of Lightning Vapes Ni200 when both dirty and cleaned, I am hereby designating you the ECF official Ni200 taster.

And you'll be pleased to know you've been tasting Chinese Ni200. (Or maybe not so much :-(. ) I recently placed an order for a couple spools of 28 and 30 gauge Ni200 direct from Temco; if you wanted, I'd be happy to send you some lengths and you could compare them as received, and after cleaning using your method above, to the wire from LIghtning Vapes. (And keep the extra wire.
Long as I'm offering to pay tomorrow for a hamburger I want now (some of us are old enuf to get that reference, right?), anyone have any genuine Temco wire they'd be willing to trade a length of now for some of my Temco wire when it arrives? (I'll make it worth your while.

) When I ordered it Temco gave a shipping time of 13 weeks, but since the shipping time doesn't seem to change I've got the sneaking suspicion it'll arrive earlier. (But that's just a guess.)
Now all I need is my Vapor Shark to arrive so I can actually use all these goodies. lol