I haven't read the other thread you are talking about but Ball pythons are ground dwelling snakes. They don't have the same climbing ability that a corn or boa has. So, I would guess that that is the difference you are noticing, not that he is weak. I wouldn't think a kink way at the tail end of his body would be a big problem.
Another possibility is that he has some of the spider wobble in him. Is he a spider or spider cross?
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