Wow! And I thought Haworthias and Aloes were contentious. I think we have the classic lumper or splitter dichotomy going on here, mixed with a little secrecy and professional botanical bickering. Personally, I'm a splitter but redeem myself with being content to recognise species with a range of varietal splitting.
This exchange reminds me of the 'two' specific epithets for Aloe vera: vera and babadensis. It has been demonstrated that vera was validly published at least 18 days before babadensis. The 'argument' has been going on for more than 200 years, lets hope this one doesn't run as long. Priority of publication must take precedence, therefore, however long perangustum has been kicking around, puffii must prevail as it is properly published.
My label will be adjusted accordingly. Thanks.