Well the wobble is an unwanted defect and most breed them with non Spider gene morphs so at least it's watered down to 50:50 chances but presumably if it's a Spider x Spider the gene is 100% going to be passed onto the offspring !??
You can't water down the wobble, it's attached 100% to the spider gene (and the other wobble genes as well). If you have a spider, it has a wobble. End of story. It may not be severe, but it's certainly there.