These two tires are touring tires and probably should not be taken off-road. 25% off-road seems to be a lot... 1 out 4 miles? These two tires are going to suck real bad if that's the case.
We may be need more about info to help you out. What type of offroad? Snow? Lots of rain or no rain? Mud? Etc...
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2008 KK Sport, Light Graystone Pearlcoat, Selec-Trac II, tow package, Firestone Destination LE2