There was previously a published paper that did a hierarchical clustering of a bunch of whiskies:

     A Classification of Pure Malt Scotch Whiskies
     Lapointe and Legendre
     Appl. Statist. (1994) 43, No. 1, pp. 237-257

http://www.dcs.ed.ac.uk/home/jhb/whisky/lapointe/text.html

http://www.albany.edu/psychology/bcd/share/scotch_classifica...

It would be interesting to compare their results with the OP.