Your HL2 would make an ok internal prep for them.
If they're fresh/new thin right sides, you may need nothing internal.
Personally, I prefer to use our Medium Rare internal (2 ounces in the RS and 1 ounce in the LS) with Vega Yellows on pavement. It helps condition the tire over several heat cycles as the oil is pulled to the surface of the tire.
If the track is tearing up your tires, and/or you are building too much heat in them, then our internal will help as well.
Scuffing a set or two and letting them set up a couple of weeks will be helpful as well. The scuffing and running a heat cycle through the tires will "toughen" them up a bit and they will harden a touch, which will also help.
Definitely scrape them clean with a heat gun after each time you're on the track. It will not hurt to sand/refinish them at that time as well.
Use just course enough to remove the left-over dead rubber/clag, dirt, etc from the tires, then finish sand with a finer grit to leave a plateau finish (similar to honing an engine cylinder.) I use a belt sander and plenty of Windex non-ammoniated window cleaner as a coolant. I am happy with the resulting finish.
Feel free to call our shop if you have specific questions about our Vega tire program, or our preps.
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?Thanks and God bless,
Brian Carlson
Carlson Racing Engines
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bcarlson@CarlsonMotorsports.com