There is an issue  with the Vernier.  It's using the old ModuleRCS, which is why the plume is backwards and very large.  I've written a patch to fix it.  The patch is good for 1.4 and 1.5  Just drop the following into the GameData directory, call the file MM_SYvernier1.cfg, or download it from this link: https://www.dropbox.com/s/jajttxynlhlf1je/SpaceYVernierPatch.zip?dl=0 License for the patch is the Unlicense  
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