Im sticking to my original diagnosis... see how the coil of the plug is grey/white and dull not shiny? That is too lean on the HSN. Ive never seen an engine turn color like that from a LSN thats too lean.

I recommend starting with a new plug then richen the HSN til it sounds like it swimming in fuel.... then lean your bottom and lower the idle until you get 3-4 seconds doing the pinch test 1" from the nipple at idle fully warmed up. Get the bottom stable then start bringing in the HSN slowly. It may take a full turn on both by the time your done.... no telling. You can get the bottom in the ballpark faster if you want to set your idle gap to around 1mm or slightly less, find a paperclip or something thats about the right size. If it fires and wont idle, start leaning the LSN until it will. When you rev it cold it should rev and then sound super rich, if it does your in the neighborhood, it should immediately drop to a nice low idle.... if it sits up high then drops after a few seconds, keep leaning the bottom and lowering the idle.

That sucks your locals are too busy being rockstars to take 5 mins to help someone.