No mystery. As I've explained before, if you double or treble the ingredients and you get a different result it's because you've cooked it differently, it's that simple.
Were that not the case, again as said before (and undoubtedly will have to be said again), by the time your up to ten times the quantity or higher, you wouldn't need any spices at all! Reductio ad absurdum wins the day once again.
