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I will put it on later, but mostly use under 3A. Fan is not necessary.
Radioshack sell ones that are basically the same size as 2 of the board you used. There like $2 Bucks.
Why 6A? Show me a diode powered by a buck/boost that needs 6A. Hell, show me a buck/boost capable of reliably running a diode at 6A.
If you want wattage just buy a 200watt cheapie 1 ohm resistor.
Or a shunt with 5+ times the current capacity and 99% less heat, perhaps.