If you're using Krug (or any of the copies of Green) you will need to set your tires out for a couple of weeks before using them again.
Krug, goat, wintergreen, etc is very aggressive and pulls the oils to the surface of the rubber every time that you use it. Unless you are replenishing those oils, you are continually depleting them and over time they will dry out.
Once they've dry cracked, they're only going to be usable on very high bite tracks. I've seen some dry cracked tires fly indoors on syrup, but rarely on dirt. Big momentum tracks where you are not concerned about sidebite and only rollspeed, sure, they'll be ok.
If you're just trying to save the tires, you can try to revive them with a good internal conditioner that puts oil back in the rubber, or needle some in from the outside as well.
Our Pink Panther does a real good job of this, and we offer a version called Pink Panther Thick Formula that has more of the heavy oils in it.
Keep in mind that if you're putting a lot of oil in the tires, then they would normally be better suited for soft low bite tracks, and they will never be as fast as fresh(er) rubber for that.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
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www.CarlsonMotorsports.com
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32 years of service to the karting industry ~ 1Cor 9:24
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bcarlson@CarlsonMotorsports.com