Bracker1,
The problem with the head nuts needing re torqueing is the paper cylinder base gasket which can sometimes be too thick, compresses and so effectively reduces the the torque the nuts are tightened to. A couple of heat cycles over a few hundred miles settles the base gasket and then you can re-torque the head. Some people have used an o-ring in a grove machined in the bottom of the cylinder muff and eliminated the base gasket, but I don't know if this eliminates the problem of re-torqueing.
Cheers,
Simon.