used to work on a pile of these at the Ford dealer in 1989-1992. have an injector upper body with the thread removed just for those pesky injectors that that unthread when puling out, I even shaved down the base of another with 2 notches for cleaning out the copper washer mating surface. (almost like a reamer) you did pretty good on this . 2 copper washers isn't a good idea but may not affect anything.
we always put air pressure into the glow plug hole when cleaning out copper washers in the bore.
once they were out of warranty we saw them again........................in 87 Ford offer a 6 yr unlimited mileage warranty on some trucks but it didn't last past 1987
summer: RIP 72 Bronc, 68 Merc,
Daily:94 Exp xlt , Barney the PSD CW
projects: all on hold for now