For some reason, the wobble goes hand in hand with the spider trait. Outcrossing tends to minimize how much the trait expresses itself, but doesn't always take care of it.
Most spiders seem to have little or no wobble these days, although some with more severe cases are out there. As far as I know, the spider gene is the only one that so consistently has a problem with wobbles.
I personally think the spider gene is a great example of the community working together to eliminate a negative trait - by outcrossing and letting newbie keepers know about the trait, as a group it appears we have greatly minimized how severely and how often the trait is expressed. When spiders first came out, I seem to remember the wobble being a distinct thing with nearly every one.
In any case, the worst wobbling usually happens when the animal is stressed, and some animals that don't wobble at all may begin to wobble during extreme stress. My adult female wobbles only when she's been moved to a new cage; aside from that, there's no wobble to be seen at all.
-Jen
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