Really, I've never heard that. I've always heard lucas injectors weren't all that great. The new lighning does come stock with 42lb injectors. My car runs great, solid idle, great power, and decent gas mileage all this with 50lb injectors.
You can adjust just about anything with the Tuner. If you do your homework and your positive it isn't anything mechanical you can make it drive like stock. Go ahead and join the group at
http://groups.yahoo.com/group/EECTuner, you can get a wealth of information there. Try this too
http://www.iwantperformance.net/cgi-bin/ultimatebb.cgi and of course
http://www.eec-tuner.com
Good luck
Brad