Some of members used arch enemy.They said,that they are good.They rolling and pulling arches.This job must be done professionally,if you don't want make a crack on your paint.
Glad,that you sorted problem.Long time ago I done the same with metal plate,but till I made revs 2000,engine light comes on.Maybe plate was in wrong place.If you can,take photo,I want to see,where you put.
Couple months ago I have the same problem.So bought two refurbished injectors from bosh.Smoking still was,so bought third injector.Still last injector not coded but car much less smoking.at the moment two refurbished,one new and last old.