No one I'm aware of has
ecu tuning capabilities for the oem (gc8)
ecu SOR. You're alternative would be a piggy back or replacement
ecu, but the $/gain might not be suitable.
Possible piggy back options would be Apexi Safc II or Neo Fuel controller, and an Apexi super ITC which will control timing. You should be able to source the SAFC and ITC second hand if you look around and shouldn't cost the earth. That way you do control the parameters that count and can fine tune for possible exhaust and intake modifications - without breaking the budget.
Good luck.
P.s. If you do go down this route, Anthony from Xspeed or Zack from Cypher industries will be able to tune the
ecu for you and both are located SOR (O'Connor).