The entire cylinder/head design needs to be seriously reworked to eliminate the major reduction in clamping force in the interference fit zone, when operating at high cylinder head temperatures.
Why bother when good temperature control solves the problem? Just how hot do you want to run them? A better idea would be to have engineers write the POH instead of leaving it to the marketing department.Mike Busch has over 4,800 hours on 9 of his 12 cylinders simply by having an alarm sound whenever any cylinder passes 390*F and then taking immediate action to prevent the temp going higher.