Jets are gettin big!

Ok, Im willing to learn.
I have never heard of tuning a fuel curve on an engine of this caliber using cruise temperature.The reason I doubt its accuracy is because at any legal cruise speed the carb is not even maxing out the transfer fuel supply yet, never mind the mains. If you doubt that, put some 60s in there and I guarantee you can cruise at 60 mph with them. Getting to that speed is a bit of a slow process, tho.
I have had a combo like yours but with Eddies on it. I even ran a plug in the PV port.And all kinds of different MJs. None gave me temperature troubles. But then my timing was already pretty close.And I was running a mechanical fan.(Before this is over I think you will be too).
So, help me out. Where did you get this tuning idea?