I too have had wildly mixed results with Sol/Set over the years but as others have suggested I think the variable is more the decals and less the setting solutions.

I had HORRIBLE wrinkling issues with a sheet of Hassegawa decals a while back. Very next kit was also Hassegawa of similar vintage and they worked fine.  Same bottles of Set/Sol.  Lately I'm building Bandai kits and buying their water-slides and I'm finding they sometimes silver, sometimes don't, even across a single sheet!