Personally I don't see anything wrong with your tires. The rubber is not "tearing" at all. What you see me is simply small rolls of melted rubber. The surface of the rubber beneath that is actually pretty smooth. I'd be pretty happy with my tires looking like that.
If you want meaningful tire temperatures then they need to be done in real time. Otherwise, the cool-off lap and the rest of the time you take getting back to your pits will have a huge effect on temps causing them to be lower than they actually were on track at race pace. Think of the opposite effect: The rule of thumb for warming up cold tires is two laps of progressively stressing your tires to get them to come up to race temps so why wouldn't we expect the tires to shed a significant amount of heat as we slow down?
Just a thought.
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