Flyman:
You just became a wanabe Test Pilot(with passengers onboard); I hope you know more than the Engineers and TP's at Airbus that designed the 320 and developed procedures.
The interaction with all the computers and systems on Aibus FBW are very complex, so the advice is to stick to documented procedures. Shutting down a pack if ECAM or procedure does not call for it leaves you exposed to a lot of problems; legal and technical. All for temperature control!!!
If you think you have discovered a good way to improve a procedure, send it to Airbus and they will look at it and test it properly. Do not expose yourself and the passengers to your "ideas" if you realy care about safety.
I will send what you did to Airbus and get an expert opinion; it will take a while, but when I get it I will post it.
G