The clear is actually really hard and a lot more resistant to the thinners than the coloured lacquers. The stain I used was a water based one from a luthier supplier, so I don't see it being particularly reactive with the lacquer.
I'm getting there with the lacquer removal. Generally sanding most of it now.
I'll look up 'shrink back', Phrozin, and see if I can find anything that makes sense to me.
If it had all happened after I'd put the guitar together, I wouldn't have minded so much, but it would have been impossible to clear coat and flatten without an excessive thickness of clear coat on it.