If your objective is maximun horsepower, then running cooler coolant is desired.
one experanice I had with company car decades back. After having a coolant flush, I notice the temp gauge was running about one divsion lower, but I just keep driving. the oil sample after running that way for a few thousands miles came back the oil was contiminated with fuel and some metals! I check the thermosat and found the oring had been left out. after replacing, temp was back up and following oil samples normal
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