* You've probably checked the fuel pressure, the coolant temp sensor, and the intake air temp sensor values.
* What do the adaptation values tell you? Is the fuel management really trying to correct an over-rich condition? Would corroborate the HC values.
* Beckmann Technologies will test your controllers for a small fee if you suspect, but can't prove, a problem there.
* On this site, have you checked this out. Go to DIY Links (see the tab at top of page). From there go to DIY Links by Parts Catagory. Posts are organized by relevant "parts area". You might find something useful in "fuel injection". Good luck.