I'll have to look into running the distill water and water wetter instead of coolant. You still running thermostat in yours?Glycol based Coolants (antifreeze) retains heat. Good for winter but bad for heat rejection. It will raise the boiling point some but in extreme duty situations can’t reject the heat fast enough. Race tracks also don’t like it because it makes the track super slippery when spilled on the racing surface. Distilled water and water wetter is good. I ducted air to the cooler but tried not to rob it from the radiator, so straight ducting.
Will have to look into the FP350S ducting that I'm running and see if it has closed off any airflow.