VTC_CIVIC got 242WHP out of an LS running 10psi on a .50trim T3. That T3 will be able to push 15-17psi EASILY for that Z6 motor IFF you can properly manage the airflow / boost. FMU will not cut it for 15psi.
If you insist on keeping the FMU, try getting a MSD BTM so that you can retard timing as boost increases. a FMU and BTM would probably be good for at least a couple pounds more. FMU+BTM will be asking for trouble past 12psi.
why don't you consider moving over to TurboEdit, Uberdata or Hondata and tuning it? You'll get a lot more power (safely) out of that turbo if you can control timing going into boost. Lack of ignition retard in boost is the main thing limiting your boost levels / power production in the current setup.