Since the last patch if you're using a high grade shield cell you'll need to launch a heat sink at the same time to keep the heat down and avoid module damage. This is certainly the case with the 8A SCB in my Cutter.
In the Cutter, I also have a bank of 6A shield cells that I use to "top up" my shields when there's a quiet moment. I found that if I stow all weapons, turn off thrusters and sensors then the ship's temperature drops to 22%. This is low enoough to use a 6A shield cell without causing undue heat and damage.
This might be worth testing out in other ships and other SCB types.