AMC, thanks for the very informative reply. If I'm at the mercy of a robot or underpaid human spot welding these tips on the grounds for iridium plugs, I may have no choice but to consider Autolite or Champion brand plugs then. In looking at the pics on RockAuto, they don't appear to have extra tips spot welded on the grounds for iridium plugs.
Seeing how all 4 of my used plugs appeared to wear evenly, I'm guessing I didn't have to drop $200 on new Denso coils via RockAuto. Oh well. The Versa had 120k miles on it. Maybe it was due. Peace of mind perhaps? [emoji56]
Haven't driven the car much in the last few days to see P0301 return. I'm hoping this is now a non-issue. I'll post a follow-up if so.
Thanks for the replies guys [emoji106]
2011 Nissan Versa HB 1.8S Magnetic Gray
2011 Nissan Versa HB 1.8S Expresso Black