wow big problems. have you check your crankcase vent? Make sure that's all flowing free and its connected to the intake side. The oil dumping out is not normal.
when you replaced your injectors did you put all new o-rings and seals on all of them?
When you installed the injectors did you drain the rails out? then take out the injectors and sucks out any additional oil in the holes?
Sounds a little weird that it would have started up that fast after an injector change out. mine took like 15 min. just to get the high pressure rails filled back up and build up pressure. Just talking out loud.