Ditto, its a tough one to swallow but the rewards are there once they have been replacedI have had not all but most of these symptoms.
Since changing injectors it has been running like a dream, about a month now.
Slight increase in fuel pressure improved the fuel spray pattern. Now it's gone back to globs of fuel its not burning correctly.
Do you have a good rolling road with diagnostic testing equipment in your area? I know that's how an Fsi on here was diagnosed before it had new injectors fitted. It may be possible to see the duty cycle of the injectors via vcds with the engine running.
Have you tried a tank full of super unleaded and a bottle of Wynns 3 professional injector cleaner?
Worth a try before going down the new injector route?