There are a few things that come to my mind. On the spark plug issue. You say that if you run it rich enough to take throttle, it fouls the plugs in a short time. This tells me that the plugs you are using are not of the right heat range for the fuel. My suggestion there would be to try some hotter plugs to burn them clean with the richer mixture - at least in theory. Getting the engine to take throttle with the leaner mixture could be an issue of timing curve. I'm not saying that the timing curve is incorrect, just not well matched to the current fuels. And, I am not just talking about timing setting. There are THREE factors for timing - base timing, centrifugal advance, and vacuum advance. Altering some of these settings may help to alleviate the problem. Carburetor settings could also be an issue, although to a lesser extent. I might look into resetting the accelerator pump. Richen it up a bit, and it should take throttle better. I would adjust it to a longer stroke if possible, and to begin pumping a bit sooner. Also, do not overlook the check ball in the carburetor body. If it is a bit sloppy fitting, it might benefit from "coining" the seat for a better seal. As far as warm starting, the one thing that comes to my mind is vapor lock. Check the routing of fuel lines and the isolation of the fuel from engine heat. Could it be that heat from the engine is overheating the fuel causing it to behave badly on an attempt to restart a warm engine?
On the one hand, I see little difference in today's fuels versus older fuels with the exception of the addition of alcohols. Both Ethanol and Methanol. For the most part, the fuel has only one main function, and that is to burn in a controlled fashion to produce power. As far as I can tell, there is no "black magic" or "voodoo" involved. As far as I know, the petroleum coming out of the ground has not changed much over the last few million years or so. The levels of refining and the additives may have changed. But, if you put the "old" fuels and the "new" fuels into a laboratory, it might be hard to find differences in the properties of each one.
Your problems are not impossible to solve. They might take a bit more thinking in terms of where to look for the causes.
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