Hmm...it seems as though your 0% column should actually be rich enough for 500cc injectors - so that most likely is not the issue. I have 650cc injectors and have -20 to -22 in there. Unless for some reason you have a low idle fuel pressure - not sure what fuel setup you have.

 

What is the max boost you are running? If its 8-10 or so I would definitely recalculate your maps to get rid of the -2 column and make min map 1 and max 10 so you have 10 columns, 1 for each psi makes much more sense.

As for your 0% really depends on your fuel pressure. Wat is it?