Your JDM V7 heads are small combustion chamber heads. Your Compression ratio is high. Not so big a deal on race fuel or 93-94 octane. But hell to pay on 91.
I think you should Run a V7 ECU that is made for that engine with a Utec. The Hydra for your car simply blindly pulses the AVCS solenoids and does not offer closed loop AVCS cam control. It works but its not ideal. You Def want to run AVCS however.. If not you will loose a Great amount of power.