I'm guessing that if these tires came on the bike as original equipment, they aren't really high-end cross tires, unless it was a really high-end cross bike ($2,500+). So the compound won't be really all that soft. All the other issues have been pointed out. If they were mine, I'd run 'em till they were dead and figure out in the meantime what I wanted for the next set. Only reservation being, if the OP were considering trying their hand at cyclocross next season, why not save the tires for that, but otherwise. Burn 'em up and upgrade... and be careful diving into corners.