OK, so on the coil: funny thing.  Hard to explain, but that last build kin'a vaped like it took to make it.   I swear I could feel the electricity hesitating at the crooks.  It vaped . . .. .  "complicated".  So, I took a chance on 2mm ID, which allowed me to just do a straight-up 5 3/4 wrap (still right around .162Ω tho).  Anyhoo, the cotton is keeping up just fine at 2mm ID on the 23g wire, and I'm a happy camper.  Great vape!
So, now, these↓ pics here may not 
look like pictures of magnets . . . but, believe me when I tell you, these here are magnet pics.  I'll start prepping the mags tonight and insert them into SFM's "inbox" tomorrow to see if there's any attraction ( . ..  . errrmm . . I mean install them in the mods tomorrow).