Never had any sludge type issues at all. I feel that issue is more related to the oil you use, how often you change it, and whether the oil has a good detergent package.
If we still had 100 octane at the pumps like we did 45 years ago, I probably wouldn't be so concerned with engine temps and cylinder pressures. If I weren't pushing the pump gas envelope with the crappy pump gas we have now, I also again, probably wouldn't be worried about engine temps and cylinder pressures. I'm the type of street guy that will build the engine to push what I can out of it with the given pump gas we have to work with. Others just want the engine to run and get from A to B with little concern how much power it makes, some even want to run the cheapest gas they can find. As long as it idles smooth and makes vacuum most here are happy. Those types of engines probably don't care how hot they are running.
Everyone will have a different situation.
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