I ended up with a set of Yokohama Advan A048R semi-slicks for my Polo due to a ridiculously good deal they had on some older tyres.
A lot of posts I'd read (trawling the general web when deciding on semi-slicks) said that the A048R go hard after not too many heat cycles but this may be due to them not being broken in properly. I was advised to drive to the track with them to put a gentle 1st heat cycle into them which should make them stay soft longer and be more predictable. They certainly stuck far beyond what my nerve would allow me to push the car at the faster corners. Only time will tell if they go hard after limited heat cycling.
Yokohama recommend 33 to 36 psi as the operating pressure you should be aiming for. All other manufacturers would have an advised operating pressure range for their tyres so you just need to monitor the pressure after coming in from the track and adjust accordingly. You may have to adjust each corner differently depending on the track/car/driver...
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