I don't know about overheating but I got them real f'n hot. I got five runs due to a timing error and did not water them. We had short turn around times and my best was the last run. They did not lose grip on that grippy concrete. Was only 1 sec off Umholz's FoST on a 61 second run so I was happy. They were heat cycled and I think that helps.
I remember in 2011 watering some Falkens on my GTI and they got slipperier than snot.
I think they have better grip than the Dunlops and in both weekends could pull out of a corner much better that before. With only 215x16's I'm missing a lot of contact patch but think they outperform the Dunlops. I sold the Dunlops to a friend in an STF 04 Focus and know what our time deltas are from past event's so will know more this weekend after the 2 day Midiv.