Assuming you're even mildly competent with a soldering iron and somewhat competent tuning a EFI engine you can do it yourself too. Socket your LM/SMEC, get a copy of dcal or chem, a prom burner and some eeproms (both can be had for less than 100$), and you can setup your own cal any which way you want.
BTW: I've run 20psi on the factory injectors with the factory FPR and my wideband showed 10.5:1 the whole time. However, my car is factory intercooled and has a full 2.5 in exhaust from the swingvalve back.