Did you ever sort the problem of bigger injectors? I guess you will always be limited by rs4 injectors capacity.
I don't think its really a problem, they have a limit of around 500hp, which for most is fine.. Hence the slow development of large capacity FSI injectors..
But at the moment yes, the limit is with injectors.. Obviously the option is out there to run another set of non fsi injectors in a custom inlet manifold, or even a large capacity 5th injector in the inlet pipe and run it on a separate standalone but I want to wait until there is a realistically affordable uprated FSI injector that will flow enough..
Just a bit of a waiting game at the moment, everyone who is tuning 2.0T FSI is in the same boat unfortunately..