I was the person who wrote
the specification for the RLV @adjustheight command, and this command works as intended... It is used in my products too (Cool Collar, Cool Cuffs...).
If RLVa and/or Firestorm and/or the OpenCollar implement it differently, then this is up to the script author to make for discrepancies and adapt their scripts to the various implementations (they can easily test the RLV "flavour" via the @version command).
I suggest that you redirect your request to the OpenCollar scripters.
And please: my viewer name is
Cool VL Viewer,
not Cool Viewer.