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You have a rom tune so there is a good chance your problem cannot be "fixed" without altering the tune... which you cannot do...
My suggestion is this,
Get the car to DRIVE perfectly fine. Fix everything about the way it drives (by altering fuel pressure / maf sensor / injectors / etc...)
THEN worry about the idle. Use a SAFC-2 to dial in the idle air/fuel ratio as desired.
Do not use the SAFC to dial in anything except idle fuel and it will work fine.
-keep in mind any air leaks, and old maf hot-wires (is the maf filthy or old?), will also lead to this issue you have.
-So will an exhaust leak (O2 reads lean at idle because of exhaust leaks).
-so will improper O2 wiring / bad O2 sensor
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