If it's good going down the road and heats up when idling. Blame the fans.
2800 cfm is about 2/3 of what I like to see on electric fan used as the primary cooling fan, depending on which brand/model/mounting etc, you could even be at 50% of the value you think you are too.
For a street strip car, I much prefer keeping things at thermostat temp, and if it takes an engine driven fan, so be it. I would have to assume as you get up to speed, the amount of drag gets less and less due to vehicle speed, so I doubt the HP gain would be functionally significant to boot.