Over the course of 10 years instructing on track, we've found the HPS to be a beginner pad at best. Figure once you progress out of DE 1 or 2 you should be stepping up to a more track oriented pad. There are no silver bullets here in terms of street and track use, as others have said ideally swapping pads for the track the day before is probably your best bet. However that isn't always done as easily as folks think.
Hawk HP+ are great for street and auto-x and DE1,2 and into 3, lots of dust and squealing
Stoptech Street Performance are a higher temp pad than the HP+, squeal less and dust less
Carbo Loraine makes a pad (the exact model escapes me right now) that we've found to be a great street and track pad even up to the higher levels of DE.
Driving style and particular tracks will also effect your pad choices as well. A lot of it is trial and error unfortunately.
-mike
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 '14 Touareg TDi | '04 Nissan Armada | '13 Subaru BRZ
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