Purple ICE is a good bet. Is the engine oil regularly changed? Is it a diesel formulation? Have you looked into a larger oil cooler instead of a secondary one? Uprate the turbo to one with ball bearings instead of thrust bearings and it will run cooler and spool up more freely.
You could always cut a vent in the bonnet - I know you like the sleeper look but in hot weather you need all the help you can get.
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