SR20 Idle problem

O guys here’s my problem. I have a redtop and im running 550cc inj, megan FPR, 300zx maf and a walbro 255lph.

Even with all of this im still having to be in the positives 10 on my AFC in order to get my car to stay out of the 16-17 afr’s (LEAN)

I have been having this problem for a while now and people have been saying it was the q45 maf I had before but now I have the same prob with the 300zx maf.

Im also getting a knock on the afc but mostly on idle.

thanks guys…