I have had failures on that style of resistor where the magic smoke came ou=
t. I think there was an impulse current not too much higher than the curren=
t required for maximum dissipation.

But looking at the photo of your head, I suspect you could get it a lot hot=
ter by simply putting some Rockwool or similar insulation around it. You ar=
e going to be losing most of your therms to the atmosphere, and some simple=
, but high temperature insulation will make a world of difference, especial=
ly as you say the temperature is 'almost there'. Personally I would try thi=
s before attempting to get more heat out of the resistors.

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