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Hmmm...
If you have the data, it would be very interesting to see ambient temp vs hot tire temp on various days. What you might see is that at 60 degrees ambient the tires get up to 140 (80 delta), but at 80 degrees ambient the tires get up to 180 (100 delta). This would confirm that you are loosing a lot of stick because the tires are not getting hot enough- if they were equally sticky you'd expect the temperature difference to be the same.
I also think if you ran the A6 at 60 degree ambient you'd see it get up to maybe 160 (100 delta) or greater instead of 140 with the R6.
I don't have a temperature vs c/f curve for the hoosiers, and I'm sure the race teams that do will guard that data closely, but you can get a good idea of the stick you're seeing by measuring that temperature difference from ambient.
My bet is that your first priority needs to be to get the tires up to the lower edge of their "recommended" temperature range. I suspect that until you get to 180F in the R compound you'll be slower by switching to a wider tire. Once you get into the suggested operating range you'll be faster going wider.
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