When I read 'had a bad wobble' 'was corkscrewing in the past' and so on, then he's exhibiting bad motor control of the head later on specifically while feeding, I figure it's due to the neurological condition brought on because of the spider gene. I know there are great examples, but denial about the potential is just denial. The condition doesn't go away with age, but they might have better times and worse times. First thought would be husbandry adding stress and making the condition manifest worse, but your temps and humidity and general environment sound adequate at least, nearly ideal (just be careful about the cold side in the winter). The food item IN MY OPINION is judged by the belly of the animal, same circumference is fine. People might disagree about this, but it would not make issues at the mouth but further down if it were too big.
So basically I imagine it's an example of the possible negative aspect of spider balls, the neurological disorder giving bad motor skills of the head. I have had a bad experience with a definitely mentally disabled spider ball, and I don't intend on owning another because of it. But that's up to the individual owner. The denial of the condition altogether, however, that is not going to help educate. "I have good examples of healthy spider balls" does not mean they are all healthy.
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