I used heat sinks when firing an SCB when Horizons first came out, but stopped shortly there after when I saw that the module damage from heat was minimal. I don't even have HS on my combat Vette, or any ship in my fleet for that matter.
Here's what I do..... If I need to use an SCB, I don't use energy weapons for 2-3 seconds so that the ship can cool down some, fire the SCB, then wait until heat is down to 80% or so before using energy weapons again. Done. Yes I sustain a bit of module damage, but it's minimal and I typically never go through more than two full SBC units in a RES session (firing the 7A SCB a total of 10 times). I carry a AFMU on board in the event that I suffer serious module damage but I have never ever used it.
In this
video at about 1:30, I fire a 7A SCB. You can watch the heat indicator during the shield recharge.
I hope this helps.