Hey Dom
I'm running the Havok Pro in both my B4 & B44, with the later running down to a 5.5t. Haven't experienced any problems with this combination in either car.
I would recommend running the standard fan in 4wd with low wind motors, and depending on the model of 2wd you'd be aswell using a fan too. Extra cooling is always a good thing. In my B4 I've opted to remove the standard fan and fit a 25mm fan on it's side next to the speedo, it connects to the speedo in the normal way. This is simply to fit things under the bodyshell.
As for settings, the Havok Pro gives great adjustment on all options.
One thing I definately do is to run a power cap on my Spektrum recievers to guard against voltage drop when applying full power from standstill or slow speeds. This is probably the norm for most people, but worth a mention if you're running 2.4 equipment.
Any questions, feel free to ask.
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