So yes, with the extended score, 160 is not the highest? Or does the difference between the FSIQ and the EXIQ go beyond the second being an extension of the first?

Does the EXIQ represent the score or is it the FSIQ that you should use as a guide and hold the EXIQ in a special category of its own?

Despite their other failings, older tests at least seemed to provide a single number, ie: two hundred and somesuch, which represented the final result (so far as I know).