I have 3 Spiders in my Collection & 2 hatchlings. The wobble is simply a part of what a Spider is. It`s a part of them and it`s kind of endearing. My male has the most pronounced wobble of the 3 adults. But, It`s only really noticeable when he is "hunting". He is an awesome eater and an awesome breeder. He throws female heavy clutches and makes baby Spiders that are (IMO) some of the best I`ve seen. So, When he launches himself out of his tub (mouth open and heading straight for me) and completely misses the rat I`m holding in tongs for him, I chuckle at him and love him even more. To answer the question about what to feed to a Spider (F/T or Live) He has eaten both and his strikes are more accurate with live prey.