This question is both asked and answered many times and the std answer is schumacher mini pins in yellow compound. These work well and are the fastest tyre.
You could also go for schumacher mini spikes in yellow compound if the pins are too aggressive in the bends.
Just to raise a different issue - there are wear issues with the current batch of schumacher tyres. They seem to maintain the same level of grip as the old ones, but last 1/4 of the time so I'm trying GRP cone spikes next meeting to see if these beat schumacher's indoors as well as outdoors!
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