I have the "304" injectors in my car along with a split fuel rail, 181, and big intake. I datalogged on a 25 degree F day to the top of third gear. I saw almost the same situation as Grip, leaning out a little to about 13.1 AFR in the 5K rpm range then fatten up after 5800 rpms to about 11AFR. My recorded boost was 22.1 psi. I have a stock fuel system up to the rail, including the stock rubber hose.

I just wanted to add that my car also leaned then went fat like Grip's.