I have two spider females and both have different triggers for the wobble that I have noticed. My spider2300 g female show no signs of wobble while handling. But as soon as she goes into feed mode stand back because she go nuts. Head goes sideways and she allway miss the first few strikes. She is very unpredictable and my least favorite to feed. She hasn't tagged me yet but as come close way to many time(she was in the face height tub of my rack) she has bit and clamped on to the tote multiple times and nbot let go... now my 500g girl will start to wobble a lot when startled(loud noises, fast movements) her feed mode is not as bad as the big girl tho.