Verbal and performance IQ -- how typical are massive gaps?

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I'm curious as to how prevalent large discrepancies between verbal and nonverbal ability are within the neuroatypical subpopulation. I've read a few studies, one of which even seemed to indicate that differences close over time relative to childhood measurements (although this may have been an artifact of regression to the mean), but most of the cases described involved a relatively small degree of unevenness.

I tested 164 for VCI (verbal IQ) on the WISC-IV with extended norms, but only 104 on PRI. A nonverbal test I took later gave 148, so the PRI could have been a fluke, but I remain horrible at drawing, painting, and assembling puzzles to this day. I'm better at math than most academic subjects involving language, however.

Has anybody else had a similar experience?

My WAIS subscores were a bit all over the map.

FSIQ 129

GAI 144
-VCI 147
-PRI 126

CPI 106
-WMI 116
-PSI 92

A 55 point, near 4 standard deviation difference between my highest score (VCI) and lowest (PSI).