Disclaimer: I have no experience with your specific PCM, only OBDII PCMs in general.

That said, with all the OBDII PCMs I'm aware of, it's not possible to just 'reset' a PID by shouting data at a register. If you want to alter how much retard angle there is from EGR operation, that's something that would have to be done in the actual operating code, which is likely stored in an EEPROM. That being the case, you can't just change one value, you have to erase the EEPROM and write it all over again. This is far more complex than just the protocol you listed, as it generally requires a security handshake to allow switching the PCM into programming mode so that it will accept the erase command and then accept new data to write.

If there's something wrong with your vehicle, I'd try to actually fix it rather than praying you can change data in the computer to hide the problem. Best of luck.