Andrew
If the injectors don't flow the same amount of fuel then maybe they need to be matched - but by fuel flow, not EGT.
Before I or anyone else take the time and effort to explain the induction and fuel injection system used in IO 520 aircraft engines please let us know whether or not you know roughly how it works. If you do know give us a brief rundown of how the fuel and air end up in the cylinders ready for compression. It is very important you understand this because not understanding makes you say silly things which later will embarrass you.