I asked in an old thread but no response so I will try a new one.
After my recent build I noticed a 10 -15 % difference in the STFT. I checked everything possible and can't find anything wrong. I pulled the plugs and noticed that 2 on bank 2 looked a bit leaner than the rest. I added a little fuel to those cylinders using the "gain vs cylinder" table and the trims are much closer like that. Is there any reason not to run it this way? I am thinking there is a slight variation in fuel from either th blower runners, cam, heads, or for whatever reason, and this seems to even things out.