you "tune" it with a bleed valve on the sfmu. You put in a disk that raises the fuel pressure enough to make it rich, then bleed off the boost until the sfmu raises the fuel pressure the right amount. The safc can cause problems if you try to adjust fuel under boost, its only somewhat usefull for getting big injectors to idle better. I've used 42lb injectors for over a year with no problems and I don't have an safc.

Evo 8 - 12.3@113 circa 2009 (~330whp)
Now with BB Xona Rotor HTZ FP Red and ~450whp
2018 MSM Civic SI Ktuner TSP stage 1 w/ Honda hacked headunit.