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Following the Tellurex guidelines it turns out that the heatsink fan combo needs to be roughly twice the rating of the supplied power. Basically, any heatsink that is cable of 100 to 120watt dissipation is more than adequate for a typical 40 x 40 12v 6A setup, which typically runs somewhere between 3 - 5 amps, with cold finger temperature measured near the entry point of the finger to the back of the sensor. Design seems to be the key. That heatsink looks OK but probably needs a bigger fan if it is getting hot.
The heatsink on my setup is anodised extruded aluminium ~110 x 65 x 30mm with fins of 2mm spaced at slightly less than 2mm with a 70mm fan, if that is helpful. Temperature drop of 28 - 25C.
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