Hey, Redsy,
That doesn't sound quite right to me.
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With the lights on full, it is almost too hot to keep my hand on.
I was always taught that at full current(max.light)the dimmer carries little current.
To my way of thinking, the state that you should be testing it at is, just next to full dim, as this is where the Triac, should be switching the most load current.
But even so, I've always had my doubts about Flush-mounting dimmers in walls, especially were Fibreglass insulation is used, there's just no air circulation around the Heatsinks and chances are, the Triac, will burn out.
Also, what are the chances of you installing a Remote Dimmer unit, say up in a Roof-Void, where it has got a bit of air around it?, most only need 3-4 cores to effect this. [Linked Image]