Sure the car would feel much better if you could get the fronts up to around 85 degrees instead of 65 to 70.
funny enough i spoke to one of the mod creators about that today. He implied that 60 degrees is good enough heat for a front tyre on the 911's, but having felt the difference between a warmer and colder one on track, im not convinced ! Especially as only a few statements earlier he confirmed to me that the 70's tyres in P&G are more akin to the modern GT tyres needing around 90 degrees.
(note the 60's cars optimum is 85 degrees).
If anyone discovers the secret of getting some warmth in those front tyres, please share !!