Nice write up David, and would you believe it I agree with you on the Caribbean Rum ... I'm not a fan either, coconut splaaa
.. and in regards to the Knappogue, I think this is one of the better sherry finished whiskeys but I would be of the opinion that sherry finished whiskey is not a patch on sherry matured whiskey.
For me the sherry finish seems to put a sherry flavouring on a whiskey rather than an integration when you actually mature it with a sherry barrel entirely.
To try and explain ... when a whiskey is put into a sherry barrel for the first time it is in the first few months (anything from 3-18months) that the whiskey takes the majority of flavouring from the CONTENTS of the barrel. After that there is really not a whole pile of that flavour enhancement going on so there is no point "FINISHING" it much further. However when maturing it fully in a Sherry barrel the sherry flavoured whiskey then spends the rest of it's life integrating with the wood. So the whiskey, the sherry and the wood slowly harmonise (hopefully) into the perfect balance. And that is why a sherry matured whiskey will always be better than a sherry finished whiskey (in my opinion).
Now when I say there is not much sherry left after the first 18months, that is not technically correct and some second fill sherry casks matured for 30 odd years are really really nice if lighter style sherry casks.
And first fill sherry matured casks cab be very very heavy and of course that is where we get the sherry monsters from.
These first fill versions can definitely be an acquired taste and a lot of the IDL sherry casks fall into the sherry monster category and that is why they blend most of their sherry cask with bourbon cask to get a more relaxed sherry profile.