To prevent the finals to heat up too much, I've added some fans to blow air directly on the heatsinks.

It's 40x40x10mm super silent fans with blue LEDs (waaahh, so neat !).

I had them laying around so it's a good idea to use them.

For now (15/09/2019), I've connected them to a ON/OFF switch and I need to trigger them manually.

But I've ordered a temperature switch which will turn them on beggining at 40°C.