I'm sure there is a way to kick the speed up on the IMA fan. There are probably several ways of doing this depending on how knowledgeable you are and how fancy you want to get.
You could fake the pack temperature sensor(s) to show that the temperature is higher than it actually is. This might double mod in that it may hopefully assist less. I'm not sure of the IMA BMS programming.
You could put a manual switch on the fan to bypass the speed controller and turn it on at full speed.
You could create your own fan controller based off of temperature readings.
You could add additional fan(s). I would highly recommend using a squirrel cage design, not an axial fan (like the computer fans). Axial fans move lots of at at low pressure differentials, but stink as soon as they come up against any pressure. Squirrel cage fans aren't quite as efficient, but they will push the air even if it gets pressurized. This is what you need and it is also what Honda uses to cool the pack most likely.
How fancy do you want to get?
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