They were all Custom Shop - a short term project to get that WRC design out at a time when the Gibson Custom shop wasn't as busy and as much a profit center as it is today. Possibly, after Herr Charvel fell out with Gibson, they wanted those out quickly, I've only seen 1987 ones, By 1988, Phil Jones was already working on the successor Q 90. The Q 80ies are not any better or worse made than other mid eighties basses from Gibson.
Uwe