Welcome and glad you joined.
Different coils may change the electrical connection problem, hard to tell.
I have found that mods differ in electrical sensitivity with regards to the amount of insulation between the center pin and mod +/- separation.
If you are handy. could make or buy a new center pin head insulated washer. Your "under the pin" head insulated washer is probably crushed (shortening out) and needs replacement.
Something (may have to modify) along the lines of the W850:
Nylon Special Flat Washers [Nylon Special Flat Washers] : E&T Fasteners, Industrial Fasteners and Components
For making my insulating washers,I have a hand operated leather spoked wheel multiple hole punch that works nicely on plastic sheeting.
I never even thought about the wash itself, I may have to look into that STAT! Thanks for the recommendation and the warm welcome!