I found an article from Innovate: https://www.innovatemotorsports.com/resources/carb_EFI_mileage.php
They had the same problem I did (idle ok, but pig-rich on the t-slots).

On a 750 "Mighty Demon" they reduced the IFR from .036 all the way down to .020, IAB down to .032 and MAB up to a whopping .090. No mention of a TSR.

So their smallblock with a 253/259@.050 cam is on the idle circuit up to 2900 rpm and the mains start coming in at 2800.
That's way different from most of the tuning advice I see!
work