Spec is 36/42, I ran between that and 32/36. Zero difference in road feel or handling. Based on pressure rise for a 'hot' tire there was no difference, I think the stiff GT sidewalls kept the them from heating up enough.
I'm starting the new non-GT tires at the 36/42 spec and they instantly felt better. I have not gotten in a good run yet though to see what the pressure rise is when hot, but my butt dyno (palm of my hand) says they are warmer after my commute. My last bike (440lbs) got the expected 10%/20% rise in hot pressure running 30/33 for reference.