The EJ22T uses low comp pistons and supposedly hardened internals and also is a closed deck motor (remember it's built to be turbocharged!!!) and the compression ratio was 8.5-1 IIRC.
Your stock auto is pretty much the same as the Legacy turbo IIRC but they came with a LSD rear diff.
Arik "Tyrmelter" is running 14psi (Volvo T-3) with no add on SAFC or Computers other than a 98 RS ecu. He starts to run lean at WOT so an SAFC will help along with a fuel pump and possibly an ITC.
Andre Vanderberg is running 99RS SOHC and EJ22T block at 14psi with a Feild SFC and a Minnam Turbo kit. His setup seems to run good but it is slightly laggy due to the larger turbo.
If you want PM Andre or Let me know and I will try and track down Arik and let him know you want to ask him about his setup.