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Long story short, I shoved BOTH of these failed plugs inside, took one try with my old fashion plugger my dad gave me 20 years ago (the greased rope 20+ years old) and it held on the first try, tire now deflated, no effort, and no work; I then sliced it level, and have been riding errands to town 20+ miles today with nary a lb. of loss of air.
You should have quit while you were ahead.
You were ahead when you discovered the problem when the bike was in your garage.
Since NO tire manufacturer approves ANY patch method except a flat patch applied on the inside of the tire, you should understand that the sole use for externally-applied plugs is to recover from an emergency so you can get the tire to a tire store for proper repair.
Since you were in your garage it wasn't an emergency, and you should have just removed your wheel and had the flat repaired properly.
I suppose if you don't know how to remove the wheel and needed to ride the bike to a dealer for tire repair, plugging might have been a useful course of action. That's the only one in your situation.