In my opinion you can make other changes to your setup for less money that work equally as well for reducing supercharger coolant temps/heat soak.
The only personal experience I've had with a K.C. setup was on a '98 Lightning and it was far more trouble then it was worth. We ended up ditching the K.C. setup and just doing a better Heat Exchanger, lines, pump and larger coolant tank.
However, if you have already gone as far as you can with your current setup, the only way to dail out more coolant temp may be by going with a killer chiller setup or something similar.