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I can second all that concerning cadet tyres. If you run much higher pressures you end up with a curved surface on the tyres which gives a narrower contact patch and so the tyre warms up faster, this works well on green/cold tracks. However this narrow contact patch wears very quickly and to maintain it you have to keep raising the pressures on older tyres.
Furthermore when you have high levels of rubber on the track the triangle shape either side of the contact patch will retain this rubber, dragging off speed in the corners and even ultimately on the straights. It also means you need to get out the heat gun at the end of each session, which is of course another issue.
Developing a driving style that allows you to run lower pressures and a flatter profile (power braking and flicking to get heat into the tyres) will give you more consistent results and remove most of the need for cleaning tyres.
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