I also have a spider, and he has a very little wobble he had more when I first got him but not serious but he has less now(he is now 347 grams). But why I am replying to this thread is it seems he strikes very slow and misses a lot. I also have a normal ball a little older, little bigger he always Catches on first strike (btw I feed live). My spider can miss up to 2 times in a row before he finally gets a accurate strike.