Let me rephrase what I posted earlier, I had no apparent ill effects of the head gasket sealing and or head bolts coming loose /stretching or anything like that. Now my back yard engineering of a high compression combustion chamber had a little bit to desire.
I tend to believe that since the head bolts are used strictly in a clamping tight situation, the torque value for the bolt to remain tight would be appropiate. How much the gasket will crush is really not much of a factor to the bolt as long as it crushes enough to seal . Now the expansion rate of the aluminum gasket may play a bigger role, but I would think that the percentage of the gasket thickness compared to the thickness of the head is relatively minimal. Possibley even smaller than the accuracy rate of your torque wrench at which case the point is moot. This is of course if my assumption is correct.
I have changed a few head gaskets ; old steel oem auto to new aftermarket composite, different oem composites for service updates and have seen no service update for a different head bolt torque , plus had decent luck on the one I made as stated earlier.Nothing concerning aluminum though, I can only assume and would hope that the tuner/ designer of the kit you purchased would give you an update if a change was needed.
As a mechanic I only have to figure out what is out of spec and then basicly follow directions putting it back together. If there is no change in directions there is no change assembly procedure. It does interest me greatly at the possible problems associated with any change. I don't mind jumping into a conversation sounding like a numbskull as long as I walk away with more knowledge than I started with ;)