You're saying that relative to the 'typical individual', autistic brains weigh sensory inputs more heavily than their internal model. And that in schizotypal brains, relative to the 'typical individual', the internal model is weighed more heavily than the sensory input, right?
I don't know much about this area, so I can't comment on the correctness. However, I think we should be cautious in saying 'over-weigh' and 'under-weigh' because I really do think that there may be a real normative undertone when we say 'over-weigh'. I think it needlessly elevates what the typical individual experiences into what we should consider to be the norm and, by implicit extension, the 'correct way' of doing cognition.
I don't say this to try to undermine the challenges by people with autism or schizotypy. However, I think it's also fair to say that if we consider what the 'typical' person really is and how the 'typical' person really acts, they frequently do a lot of illogical and --- simply-put --- 'crazy' things.