I have mine set to run 88-90C. It's been working really good for a year now. I guess it wouldn't hurt to bump yours up a little.
Not sure about the turbo making your engine run hotter. Try flushing your coolant and then filling again and add 1 bottle water wetter.
Do you live in a place where it doesn't freeze? You can also had 75% water, 25% coolant, and bottle of water wetter. This made my engine run a lot cooler.
Billy
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R35 GT-R, R32 GT-R, Supra, S13, S14, FD3S
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